This preview shows pages 1–20. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Student: Grady Sinlonton
Submitted: 02f18f10 2:33pm EM.) Instructor: Shawn Panini Colu'se: MathllQ: Elenlentaiy Statistics 
Spring 3010  CRN: 49339  16 weeks
Book: T1'iola: Elelnentaiy Statistics. lle Assiglunent: Chapter 3B A certain animal‘s body temperature has a mean of 90.46°F and a standard deviation ofO.62°F. Convert the
given temperatures to z scores. a. 90.06°F b. 90.66°F c. 90.46°F a. z = — 0.65‘ (Type an integer or decimal rounded to two decimal places as needed.)
h. z = 0.32‘ (Type an integer or decimal rounded to two decimal places as needed.) c. 2= 0‘ (Type an integer or decimal rounded to two decimal places as needed.) YOU ANSWERED: nothing
nothing nothing Statistics students participated in an experiment to test their ability to determine when 1 minute (or 60
seconds) has passed. The results are given below in seconds. Find the range. variance. and standard
deviation for the given sample data. Identify one reason why the standard deviation from this sample might not be a good estimate of the standard deviation for the population ofadul ts.
5] 54 61 7’0 57 Range = 19‘ sec
Sample variance = 54.3‘ sec2 (Round to the nearest tenth as needed.) Sample standard deviation = 7.4‘ sec (Round to the nearest tenth as needed.) Identify one reason why the standard deviation from this sample might not be a good estimate of the
standard deviation for the population of adults. The standard deviation might not be a good The standard deviation might not be a good
estimate, because there is most likely an estimate, because the standard deviation is too
outlier in the sample data. large. The standard deviation might not be a good 1': The standard deviation might not be a good
estimate, because the data are from a random estimate. because the sample is very small.
sample. YOU ANSWERED: nothing
nothing
nothing
nothing Page 1 Student: Grady Sinlonton Instructor: Shawn Pal'Villi Assignment: Chapter 3B
Submitted: 03."'18."'10 3:33pm Colu'se: Mathll9: Elenlentaiy Statistics  Spring 3010  C‘RN: 49339  16 weeks Book: Triola: Elenlentaiy Statistics. He 3_ The trend of thinner beauty pageant winners has generated charges that the contest encourages unhealthy
diet habits among young women. Listed below are body mass indexes (BMI) for beauty pageant winners
from two different time periods. Find the coefﬁcient of variation for each of the two sets of data, then
compare the variation. BMI (from the19205 and 20.5 21.9 22.1 22.3 20.3 18.8 18.9 19.4 18.5 19.1
19305): BMI(fron1recentwinners): 19.4 20.2 19.6 20.2 17.8 12.9 19.1 18.8 1?.5 16.9 The coefﬁcient of variation for the BMI's of beauty pageant winners from the 1920s and 1930s is 7.275%.
(Round to three decimal places as needed.) The coefﬁcient of variation for the BMl's of recent beauty pageant winners is 6.185%.
(Round to three decimal places as needed.) 15 there a difference in variation between the two data sets? * There is no significant difference in the variations. The BMI's ofbeauty pageant winners from the 19205 and 19305 have considerably less variation
than the BMI‘s of recent winners. The BMI's of recent beauty pageant winners have considerably less variation than the BMI's of
winners from the 19205 and 19305. YOU ANSWERED: nothing nothing
nothing Page 3 Student: Grady Silnonton Instructor: Shawn Pal'Villi Assignment: Cllapte1‘3B
Submitted: 03."'18."'10 3:33pm Colu'se: 1\Iat11119: Elelnentaiy Statistics  Spring 3010  C‘RN: 49339  16 weeks Book: Triola: Elelnentaiy Statistics. He 4_ Listed below are the top 10 annual salaries (in millions of dollars) of TV personalities. Find the range,
variance, and standard deviation for the sample data. Given that these are the top 10 salaries, do we know
anything about the variation ofsalaries of TV personalities in general? 39 38 3'? 30 19 15 12 9 8.6 7.8 The range ofthe sample data is $ 31.2‘ million. (Type an integer or a decimal.)
The variance ofthe sample data is 171.120‘. (Round to three decimal places as needed.) The standard deviation of the sample data is $ 13.081‘ million.
(Round to three decimal places as needed.) Is the standard deviation of the sample a good estimate of the variation of salaries of TV personalities in
general? Yes, because the standard deviation is an unbiased estimator.
No, because there is an outlier in the sample data.
Yes, because the sample is random. * No, because the sample is not representative of the whole population. YOU ANSWERED: nothing
nothing
nothing
nothing Page 3 Student: Grady Silnonton
Submitted: 03."'18."'10 3 : 3 3pm U‘l Instructor: Shawn Panini Colu'se: Mathlh): Elementary Statistics 
Spring 3010  C‘RN: 49339  16 weeks
Book: Triola: Elementary Statistics. 11e Assignment: Chapter 3 B Fuel consumption is commonly measured in miles per gallon (mifgal). An agency designed new fuel
consumption tests to be used starting with 2008 car models. Listed below are randomly selected amounts
by which the measured MPG ratings decreased because of the new 2008 standards. Find the range,
variance, and standard deviation for the sample data. Is the decrease of4 mifgal unusual? Why or why not? 14223222312222422222 The range of the sample data is 3‘ mifgal. (Type an integer or a decimal.)
The variance of the sample data is 0589‘. (Round to three decimal places as needed.) The standard deviation of the sample data is 0.76?‘ mix’gal.
(Round to three decimal places as needed.) Is the largest decrease, 4 mix“ gal, unusual? Why or why not? * The duration of 4 mix“ gal is unusual because it is more than two standard deviations from the mean. The duration of4 mifgal is not unusual because the sample is a simple random sample, in which no
values are considered unusual. The duration of4 mix“ gal is unusual because the smallest value in a data set is usually an outlier. The duration of 4 mix“ gal is not unusual because it is within two standard deviations of the mean. YOU ANSWERED: nothing
nothing
nothing
nothing Page 4 Student: Grady Silnonton
Submitted: 03f18f10 3:33pm 6. Instructor: Shawn Pan'ini Colu'se: MathllQ: Elenlentaiy Statistics 
Spring 3010  CRN: 49339  16 weeks
Book: Tl‘iola: Elelnentaiy Statistics. lle Assignment: Chapter 3 B The following data represent the weights of 16 prel 964 quarters. Find the 5number summary and
construct a bOXplot. 6.0764 6.1484 6.2716 6.2862 6.2416 6.1423 6.1181 6.1952
6.194 6.1311 6.1716 6.2648 6.0003 6.0831 6.2151 6.3227 The 5number summary is 6.0003‘, 6.1246‘, 6.1828‘, 6.2532‘, 6.3277‘
(Type exact answers. Use ascending order.) Choose the correct boxplot of the data below. @m WWW—1mm WWW—1mm
6 6.1 6.2 5.3 6 6.1 6.2 5.3 6 6.1 6.2 5.3 YOU ANSWERED: nothing
nothing
nothing
nothing
nothing
nothing Below are 36 sorted ages of an acting award winner. Find P50 using the method presented in the textbook. 22 23 24 24 27 27 29 30 34
40 41 45 45 47 49 51 53 54
61 61 64 64 65 65 65 67 69
21 23 26 27 78 so P50: 535‘ YOU ANSWERED: nothing Page 5 36
57
70 Student: Grady Simonton Instructor: Shawn Panini Assignment: Chapter 3B
Submitted: 03."'18."'10 3:33pm Colu'se: Mathll_9: Elementary Statistics  Spring 3010  C‘RN: 49339  16 weeks Book: Triola: Elementary Statistics. He 8_ Waiting times (in minutes) of customers at a bank where all customers enter a single waiting line and a
bank where customers wait in individual lines at three different teller windows are listed below. Find the
coefficient of variation for each of the two sets of data, then compare the variation. BankA(singlelinc): 6.6 6.6 6.6 6.9 7.2 7.2 I4 I? 7.? 7.8 BankB(individual 4.4 5.4 5.9 6.2 6.8 7.? 7.7 8.5 9.3 9.6
lines): The coefﬁcient of variation for the waiting times at Bank A is 6.674‘%.
(Round to three decimal places as needed.) The coefﬁcient of variation for the waiting times at the Bank B is 23.892‘%.
(Round to three decimal places as needed.) Is there a difference in variation between the two data sets? There is no signiﬁcant difference in the variations.
The waiting times at Bank B have considerably less variation than the waiting times at Bank A. 1' The waiting times at Bank A have considerably less variation than the waiting times at Bank B. YOU ANSWERED: nothing
nothing
nothing Page 6 Student: Grady Silnonton
Submitted: 02f18f10 2:33pm 9. 10. Instructor: Shawn Panini Colu'se: MathllQ: Elenlentaiy Statistics 
Spring 3010  CRN: 49339  16 weeks
Book: Triola: Elelnentaiy Statistics. lle Assiglunent: Chapter 3B Statistics are sometimes used to compare or identify authors of different works. The lengths of the ﬁrst 10
words in a book by Terry are listed with the first l0 words in a book by David. Find the mean and median
for each of the two samples, then compare the two sets of results. Terry: 1 4 7" 10 3 3 3 2 3 2 David: I 4 3 l 4 3 3 3 2 3 The mean number of letters per word in Terry's book is 3.8‘.
The median number of letters per word in Terry's book is 3‘.
The mean number of letters per word in David's book is 2.7... The median number of letters per word in David's book is 3‘. Compare the two sets of results. Does there appear to be a difference? Yes. Based on the results, words in Terry's book are shorter than the words in David's book.
No. Based on the results, words in Terry's book are the same length as the words in David's book. "If  . Yes. Based on the results, words in Terry's book are longer than the words in David's book. YOU ANSWERED: nothing
nothing
nothing
nothing
nothing Which is relatively better: a score of 74 on a psychology test or a score of 36 on an economics test? Scores
on the psychology test have a mean of 88 and a standard deviation of 6. Scores on the economics test have
a mean ofSl and a standard deviation of8. Choose the correct answer below. The economics test score is relatively better because its 2 score is less than the z score for the
psychology test score. The psychology test score is relatively better because its 2 score is less than the z score for the
economics test score. it The economics test score is relatively better because its 2 score is greater than the z score for the
psychology test score. The psychology test score is relatively better because its 2 score is greater than the z score for the
economies test score. YOU ANSWERED: nothing Page T Student: Grady Silnonton
Submitted: 03."'18."'10 3 : 3 3pm 11. Instructor: Shawn Panini Colu'se: Mathlh): Elenlentaiy Statistics 
Spring 3010  C‘RN: 49339  16 weeks
Book: Triola: Elenlentaiy Statistics. 11e Assignment: Chapter 3 B The given frequency distribution describes the speeds of drivers ticketed in a 30 niir'h speed zone. Find the
standard deviation of sample data summarized in a frequency distribution table by using the formula below,
where x represents the class midpoint and f represents the class frequency. 7
n f x2  f x H
s = W standard deviation for frequency distribution
11 n 
Speed 4043 4447 48 51 5255 5659 Frequency 27 1 2 9 3 l s = 4.2‘ mifh (Round to one decimal place as needed.) YOU ANSWERED: nothing Page 8 Student: Grady Simonton Instructor: Shawn Pal'Villi Assignment: Cllapte1‘3B
Submitted: 03."'18."'10 3:33pm Colu'se: 1\Iat11119: Elementaiy Statistics  Spring 3010  C‘RN: 49339  16 weeks Book: Triola: Elementaiy Statistics. He 12_ The lengths (in inches) of 18 bears that were measured are given below. Find the 5number summary and construct a boxplot. Does the distribution of the lengths appear to be symmetric or does it appear to be
skewed? T5 54 47 56 52 7’55 62 37 38.5 64 69.5 7’45 43 53 46.5 60 40 32 The 5number summary is 32‘, 43‘, 53.5‘, 64‘, 75.5‘.
(Type exact answers. Use ascending order.) Choose the correct boxplot of the data below. i:
l—'—l—'—l—'—l—'—l—'—I l—'—l—'—l—'—l—'—l—'—I l—'—l—'—l—'—l—'—l—'—I
3U 4U 50 60 7O 80 3U 4U 50 60 7O 80 3U 4U 50 60 70 80 Choose the correct description of the shape of the distribution. '1' The distribution of the lengths appears to be roughly symmetric.
The distribution of the lengths appears to be skewed to the right.
The distribution of the lengths appears to be skewed to the left. The shape ofthe distribution cannot be determined from the boxplot. YOU ANSWERED: nothing
nothing
nothing
nothing
nothing
nothing
nothing Page 9 Student: Grady Sinlonton Instructor: Shawn Pal'Villi Assignment: Cllapte1‘3B
Submitted: 03."'18."'10 2:33pm Colu'se: 1\Iat11119: Elenlentaiy Statistics  Spring 2010  C‘RN: 49239  16 weeks Book: Triola: Elenlentaiy Statistics. He 13_ Listed below are the playing times (in seconds) of songs that were popular at the time of this writing. Find
the (a) mean, (b) median, (0) mode, and (d) midrange for the given sample data. Is there one time that is
very different from the others? 444 240 232 246 246 291 279 230 239 218 266 234 218 256 255 260 a. The mean is 259.6‘ seconds.
(Round to one decimal place as needed.) b. The median is 246‘ seconds.
(Round to one decimal place as needed.) c. Select the correct choice below and ﬁll in any answer boxes in your choice. if The mode is 218,246 seconds.
(Use a comma to separate answers as needed. Round to one decimal place as needed.) There is no mode. (1. The midrange is 331‘ seconds.
(Round to one decimal place as needed.) Is there one time that is very different from the others? Yes; the time of218 seconds is very different from the others.
No; all the times are not very different from each other.
* Yes; the time of 444 seconds is very different from the others. Yes; the time 01‘291 seconds is very different from the others. YOU ANSWERED: nothing
noth i n g
nothing
nothing
nothing Page 10 Student: Grady Silnonton
Submitted: 03."'18."'10 3 : 3 3pm Instructor: Shawn Pan'ini Cnlu'se: 1\Iat11119: Elenlentaiy Statistics 
Spring 3010  C‘RN: 49339  16 weeks
Book: Triola: Elenlentaiy Statistics. 11e Assignment: Chapter 3 B A set of data consists of the heights of presidents of the United States, measured in centimeters. If the
height of President Kennedy is converted to a z score, what unit is used for the z score? Choose the correct answer below.
The z score will use cm for the units. The z score will use cm3 for the units. ‘1' 2 scores have no units. The 2 score will use cm2 for the units. YOU ANSWERED: nothing Heights of men on a baseball team have a bellshaped distribution with a mean of 1 T4 cm and a standard
deviation of 8 cm. Using the empirical rule, what is the approximate percentage of the men between the
following values? 3.150 cm and 198 cm b. 158 cm and 190 cm a. 99.7‘% of the men are between 150 cm and 198 cm. b. 95% of the men are between 158 cm and 190 cm. YOU ANSWERED: nothing
nothing Page 11 Student: Grady Silnonton Instructor: Shawn Pan'ini Assignment: Chapter 3B
Submitted: 02f18f10 2:33pm Colu'se: Mathll9: Elelnentaiy Statistics  Spring 3010  CRN: 49339  16 weeks Book: T1'iola: Elelnentaiy Statistics. lle 16_ Listed below are the top 10 annual salaries (in millions of dollars) of TV personalities. Find the (a) mean,
(b) median, (c) mode, and (d) midrange for the given sample data in millions of dollars. Given that these
are the top 10 salaries, do we know anything about the salaries of TV personalities in general? Are such top
10 lists valuable for gainng insight into the larger population? 37.9 35.4 34.8 273148125114 9.5 10.1 8.4 a. The mean is 2025‘.
(Type an integer or a decimal.) b. The median is 13.65‘.
(Type an integer or a decimal.) c. Select the correct choice below and fill in any answer boxes in your choice. The mode is
(Use a comma to separate answers as needed.) * 1 There is no mode. d. The midrange is 23.15‘.
(Type an integer or a decimal.) Given that these are the top 10 salaries, do we know anything about the salaries of TV personalities in
general? Since the mean, median, and midrange are relatively reliable even with small samples, a lot of
information is given on the salaries of TV personalities in general. *5 Since the sample values are the 10 highest, they give almost no information about the salaries of TV
personalities in general. Since the mean, median, and midrange are based on a small sample, no information is given on the
salaries of TV personalities in general. Since the sample values give information about one segment of the salaries of TV personalities, they
give a lot of information about the salaries of TV personalities in general. Are such top 10 lists valuable for gaining insight into the larger population? No, because the mean, median, and midrange are based on a small sample
Yes. because the mean. median, and midrange are relatively reliable even with small samples * ' No, because such top 10 lists represent an extreme subset ofthe population rather than the larger
population Yes, because such top 10 lists give partial information about the population ‘In‘l 1 A IFFIYFl—‘T‘l—‘n A ‘ Page 12 Student: Grady Silnonton
Submitted: 02318:”10 2:33pm 16. (cont) 1?. Instructor: Shawn Panini Colu'se: MathllQ: Elelnentaiy Statistics 
Spring 3010  CRN: 49339  16 weeks
Book: T1'iola: Elelnentaiy Statistics. lle Assiglunent: Chapter 3B YUU ANSWERED: nothing
nothing
nothing
nothing
nothing nothing The geometric mean is often used in business and economics for ﬁnding average rates of change, average
rates of growth. or average ratios. Given n values (all ofwhich are positive), the geometric mean is the nth
root of their product. The average growth factor for money compounded at annual interest rates of 9%, 4%,
and 2% can be found by computing the geometric mean of 1.09, 1.04, and 1.02. Find that average growth factor. What single percentage growth rate would be the same as having three successive growth rates of
9%, 4%, and 2%? Is that result the same as the mean of9%, 4%, and 2%? The average growth factor is 1.0496‘.
(Round to tour decimal places as needed.) The single percentage growth rate that would be the same as having three successive growth rates of 9%,
4%, and 2% is 4.96‘%.
(Round to two decimal places as needed.) The mean of 9%, 4%, and 2% is 5.06%.
(Round to two decimal places as needed.) The single percentage growth rate is not‘ the same as the mean of 9%, 4%, and 2%. YOU ANSWERED: nothing
nothing
nothing nothing Page 13 Student: Grady Silnonton
Submitted: 02(184’10 2:33pm 18. 19. Instructor: Shawn Pan'illi Assiglunent: Chapter 3B Colu'se: Mathll9: Elelnentaiy Statistics  Spring 3010  CRN: 49339  16 weeks
Book: T1'iola: Elelnentaiy Statistics. lle Listed below are the durations (in hours) of a simple random sample of all ﬂights of a space shuttle. Find
the (a) mean, (b) median, (c) mode. and (d) midrange for the given sample data. Is there a duration time
that is very unusual? How might that duration time be explained? 7’? 98 238 18? 163 25? 193 380 260 238 378 335 226 244 0 a. The mean is 218.3‘‘ hours.
(Round to one decimal place as needed.) I). The median is 2381 hours.
(Round to one decimal place as needed.) c. Select the correct choice below and ﬁll in any answer boxes in your choice. *' The mode is 238 hours. (Use a comma to separate answers as needed. Round to one decimal place as needed.) There is no mode. (1. The midrange is 190‘ hours.
(Round to one decimal place as needed.) Is there a duration time that is very unusual? How might that duration time be explained? *  Yes, the time ofO hours is very unusual. It could represent a ﬂight that was aborted. No, the ﬂights have usual duration times ranging from 0 to over 3?5 hours. Yes, the time of more than 3?5 hours is very unusual. It could represent a very long ﬂight. No, there is no flight with an unusual duration time. YOU ANSWERED: nothing
nothing
nothing
nothing nothing Below are 36 sorted ages of an acting award winner. Find P30 using the method presented in the textbook. 16 20 20 20 23
31 34 35 38 39
45 48 50 57 61
'12 3'2 3'3 76 "2'6
‘
P30 = YOU ANSWERED: nothing Page 14 24 25 2? 2s 29
40 40 43 44 44
62 64 as 69 71
7s Student: Grady Silnonton
Submitted: 03."'18."'10 3 : 3 3pm 20. Instructor: Shawn Panini Colu'se: Mathlh): Elenlentaiy Statistics 
Spring 3010  C‘RN: 49339  16 weeks
Book: Triola: Elenlentaiy Statistics. 11e Assignment: Chapter 3 B Find the mean of the data summarized in the given frequency distribution. Compare the computed mean to
the actual mean of 56.1 degrees. Low Temperature ( a F) 40  44 45  49 50  54 55  59 60  64
Frequency 2 4 10 6 l The mean of the frequency distribution is 52.0‘ degrees.
(Round to the nearest tenth as needed.) Which of the following best describes the relationship between the computed mean and the actual mean? The computed mean is close to the actual mean because the difference between the means is more
than 5%. * The computed mean is not close to the actual mean because the difference between the means is
more than 5%. The computed mean is close to the actual mean because the difference between the means is less
than 5%. The computed mean is not close to the actual mean because the difference between the means is less
than 5%. YOU ANSWERED: nothing
nothing Page 15 Student: Grady Silnonton Instructor: Shawn Pan'ini Assignment: Chapter 3B
Submitted: 03."'18."'10 3:33pm Colu'se: 1\Iat11119: Elementary Statistics  Spring 3010  C‘RN: 49339  16 weeks Book: Triola: Elementary Statistics. He 21_ With a height of 60 in, Alexander was the shortest president of a particular club in the past century. The
club presidents of the past century have a mean height of 66.3 in and a standard deviation of 1.2 in.
a. What is the difference between Alexander’ 5 height and the mean?
b. How many standard deviations is that [the difference found in part (a)]?
c. Convert Alexander's height to a z score.
(I. If we consider "usual" heights to be those that convert to z scores between  2 and 2, is Alexander's
height usual or unusual? a. The difference between Alexander's height and the mean is 6.3‘ in. b. The difference is 525‘ standard deviations. (Type an integer or decimal rounded to two decimal places as needed.) c. The z score is  5.25‘.
(Type an integer or decimal rounded to two decimal places as needed.) d. Is Alexander's height usual or unusual? Usual
1' Unusual YOU ANSWERED: nothing
nothing nothing
nothing Page 16 Student: Grady Sinlonton Instructor: Shawn Pan'ini Assignment: Chapter 3B
Submitted: 03."'18."'10 3:33pm Colu'se: Mathlh): Elenlentaiy Statistics  Spring 3010  C‘RN: 49339  16 weeks Book: Triola: Elenlentaiy Statistics. He 22_ Pennies made before 1983 are 97% copper and 3% zinc, whereas pennies made after 1983 are 3% copper
and 97% zinc. Listed below are the weights (in grams) of pennies from each of the two time periods. Find
the mean and median for each of the two samples, then compare the two sets of results. Before 1983: 3.1083 3.1274 3.0775 3.1584 3.1044 3.1036
After 1983: 2.4958 2.5021 2.4841 2.4998 2.4825 2.4908 The mean weight of the pennies made before 1983 is 3.1133‘ grams.
(Round to four decimal places as needed.) The median weight of the pennies made before 1983 is 3.10635‘ grams.
(Type an exact answer.) The mean weight ofthe pennies made after 1983 is 2.4925‘ grams.
(Round to four decimal places as needed.) The median weight of the pennies made after 1983 is 2.4933‘ grams.
(Type an exact answer.) Does there appear to be a considerable difference in the means? 1' Yes, because the difference in the means is more than 5%.
No, because the difference in the means is less than 5%.
No, because the difference in the means is more than 5%. Yes, because the difference in the means is less than 5%. YOU ANSWERED: nothing
nothing
nothing
nothing
nothing Page 1? Student: Grady Silnonton
Submitted: 02f18f10 2:33pm M
Lu Instructor: Shawn Panini Colu'se: MathllQ: ElenIentaiy Statistics 
Spring 3010  CRN: 49339  16 weeks
Book: T1'iola: Elelnentaiy Statistics. lle Assiglunent: Chapter 3B Listed below are the thorax lengths (in millimeters) of a sample of male fruit ﬂies. Find the range, variance,
and standard deviation for the given sample data. if the listed measurements were obtained from fruit flies
in a particular city in a country, does the standard deviation serve as a reasonable estimate of the standard
deviation for all fruit ﬂies residing in that country? 05 0.89 0.6?r 0.86 0.69 0.64 0.87 0.71 0.79 0.?8 0.88 Range = 0.25‘ mm
Sample variance = 0.008‘I mm 2 {Round to three decimal places as needed.) Sample standard deviation = 0.091‘ mm
(Do not round until the ﬁnal answer. Then round to three decimal places as needed.) Does the standard deviation serve as a reasonable estimate of the standard deviation for all fruit ﬂies
residing in the country?
The estimate is reasonable because standard deviation is an unbiased estimator.
if 1 The estimate is not reasonable because the sample is not representative of the whole population.
The estimate is reasonable because the sample is random. The estimate is not reasonable because there is most likely an outlier in the sample data. YOU ANSWERED: nothing
nothing
nothing nothing Page 18 Student: Grady Si111o11ton Instructor: Shawn Pal'Villi Assignment: Cllapte1‘3B
Submitted: 03."'18."'10 3:33pm Colu'se: 1\Iat11119: Elementaiy Statistics  Spring 3010  C‘RN: 49339  16 weeks Book: T1‘iola: Elementaiy Statistics. He 24_ A simple random sample of pages from a particular dictionary was obtained. Listed below are the numbers
of words deﬁned on those pages. Find the (a) mean, (b) median, (0) mode, and (d) midrange for the given
sample data. Given that this dictionary has 1,463 pages with deﬁned words, estimate the total number of
deﬁned words in the dictionary. Is that estimate likely to be an accurate estimate of the number of words in
the English language? 46 65 384133 61?04449?4 3. The mean is 52.1‘ words per page.
(Type an integer or a decimal.) b. The median is 4?.5‘ words per page.
(Type an integer or a decimal.) c. Select the correct choice below and ﬁll in any answer boxes in your choice. The mode is words per page.
(Use a comma to separate answers as needed.) * There is no mode. (I. The midrange is 535‘ words per page.
(Type an integer or a decimal.) The estimated number of words in the dictionary is 7622‘.
(Round to the nearest whole number as needed.) Is the estimate likely to be an accurate estimate of the number of words in the English language? Yes, because the mean is relatively reliable even with small samples
‘1' No, because the mean is based on a small sample that has large variations among its values
No, because the mean is not sensitive to extreme variations in sample values Yes, because the mean is a relatively reliable and more consistent measure of center YOU ANSWERED: nothing
nothing
nothing
nothing
nothing
nothing Page 19 Student: Grady Si111o11ton Instructor: Shawn Paivini Assignment: Chapter 3B
Submitted: 03."'18."'10 3:33pm Colu'se: Mathlh): Elementary Statistics  Spring 3010  C‘RN: 49339  16 weeks Book: Triola: Elementary Statistics. He [\J
[Jr A student eamed grades of B, D, A, A, and B. Those courses had the corresponding numbers of credit
hours 3, 4, 3, l, and 4. The grading system assigns quality points to letter grades as follows: A = 4; B = 3;
C = 2; D = 1; F = 0. Compute the grade point average (GPA) as a weighted mean and round the result with two decimal places. If the Dean‘s list requires a GPA of3.00 or greater, did this student make the Dean's
list? The grade point average is 2.73‘.
(Round to two decimal places as needed.) Did this student make the Dean's list? No because the student has at least one grade less than 3
Yes because at least two of the student grades are B or above
‘1' No because the student's GPA is less than 3.0 No because the students GPA is not 4.0 YOU ANSWERED: nothing
nothing Page 30 ...
View
Full
Document
 Spring '10
 PARVINI

Click to edit the document details