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Unformatted text preview: Student: Grady Simonton Instructor: Shawn Parvini Assignment: Chapter lA
Submitted: 02/18/10 2:16pm Course: Math119: Elementary Statistics  Spring 2.010  CRN: 49239  16 weeks
Book: Triola: Elementary Statistics, lle 1_ Identify the type of sampling used (random, systematic, convenience, stratiﬁed, or cluster sampling) in the
situation described below. A man experienced a tax audit. The tax department claimed that the man was audited because his name is
among the ﬁrst 200 names on the taxpayer list. Which type of sampling did the tax department use? ti? Convenience sampling
a; A Systematic sampling I: .3 Random sampling .3: fin Stratiﬁed sampling Cluster sampling 2_ Based on a study of heights of men and women who are jockeys, a researcher concludes that riding horses
causes people to become shorter. Do you agree with this conclusion? Choose which conclusion you agree with. '2' '3 A. No. There is no relationship between height and being a jockey.
c; :3 B. Yes. The exercise from riding horses does cause people to grow less.
[in C. Yes. People who are jockeys eat less and therefore grow less. (it? D. No. There may be a relationship between height and being a jockey, but that does not mean that one
causes the other. 3. In a callin poll, 189,000 respondents each paid 50 cents to call a "900“ telephone number with
their opinion about an economic stimulus package for seniors. The results showed that 67% of those who
responded were in favor of an economic stimulus package for seniors. Interpret the results by identifying
what we can conclude about the way the general population feels about an economic stimulus package
for seniors. What can we conclude? {23A The sample suggests that 67% of the general public are in favor of an economic stimulus package
for seniors because it is a voluntary response sample. .3. B. The sample suggests that 67% of the general public are in favor of an economic stimulus package
for seniors because it is a random sample. .:j'_'_.’ C. The sample cannot be used to conclude anything about the general population (general public)
because it is a voluntary response sample. {:3 D. The sample suggests that more than 67% of the general public are in favor of an economic stimulus
package for seniors because it is a random sample. Page 1 Student: Grady Silnonton Instructor: Shawn Parvini Assignment: Chapter lA
Submitted: 02/18/10 2:16pm Course: Math119: Elementary Statistics  Spring 2.010  CRN: 49239  16 weeks
Book: Triola: Elementary Statistics, 11e 4_ An editorial criticized a chart caption that described a dental rinse as one that "reduces the chance of
plaque on teeth by over 350 percent.“ What is wrong with this statement? Choose the correct answer below. .;:'_V A. A reduction of 100% would eliminate all plaque, so it is not possible to reduce it by
more than 100%. .;_ _i B. The statement does not mention the initial amount of plaque.
. 3 C. The actual amount of the decrease in plaque is less than 100%. {:3 D. If plaque fell by 100%, it would be cut in half. Thus, a decrease of 200% means that it would be
totally eliminated, and a decrease of more than 200% is impossible. 5_ What is the difference between a random sample and a simple random sample? Choose the correct answer below. {:lA. With a random sample, all samples of the same size have the same chance of being selected. With a
simple random sample, each individual has the same chance of being selected. nV B. With a random sample, each individual has the same chance of being selected. With a simple
random sample, all samples of the same size have the same chance of being selected. Page 2 Student: Grady Silnonton Instructor: Shawn Parvini Assignment: Chapter lA
Submitted: 02/18/10 2:16pm Course: Math119: Elementary Statistics  Spring 2.010  CRN: 49239  16 weeks
Book: Triola: Elementary Statistics, lle 6. A study compared surgery and splinting for subjects suffering from carpal tunnel syndrome. It was found
that among 75 patients treated with surgery, there was a 95% success rate. Among 83 patients treated with
splints, there was a 75% success rate. Calculations using those results showed that if there really is no
difference in success rates between surgery and splints, then there is about 1 chance in 1000 of getting
success rates like the ones obtained in this study. Complete parts (a) through (d). 3. Should we conclude that surgery is better than splints for the treatment of carpal tunnel syndrome? [FA No, there is no statistical difference between the success rates.
if}? B. Yes, surgery appears to have a substantially better success rate.
{:3 C. Yes, the chance of getting a similar success rate is very small. [fin D. No, there is not enough information given to make a conclusion. I}. Does the result have statistical signiﬁcance? Why or why not? .ng A. Yes, the difference in success rates is large enough to be considered practically signiﬁcant.
i] B. No, the results have a chance to occur if there is no real difference in the success rates. .__t C. Yes, the given success rates are too unlikely to occur by chance if there is no difference between the
two treatment methods. CI] D. No, the difference in success rates is too small to be considered statistically signiﬁcant. c. Does the result have practical signiﬁcance? . 3A. No, the difference in success rates is not large enough to be considered practically significant.
ti." B. Yes, the difference in success rates is large enough to be considered practically significant.
u:j__il C. No, the results have a chance to occur if the weight loss program had no effect. 3 D. Yes, the given success rates are too unlikely to occur by chance if there is no difference between the
two treatment methods. d. Should surgery be the recommended treatment for carpal tunnel syndrome? {23A Yes, it is easier to perform surgery than to use splints.
{:3 B. No, there is not a practically significant difference in the success rates.
if? C. Yes, surgery appears to have a substantially higher success rate than splints. CI] D. No, there is not a statistically significant difference in the success rates. YOU ANSWERED: A Page 3 Student: Grady Silnonton Instructor: Shawn Parvini Assignment: Chapter lA
Submitted: 02/18/10 2:16pm Course: Matl1119: Elementary Statistics  Spring 2010  CRN: 49239  16 weeks
Book: Triola: Elementaiy Statistics, 11e ”L a. In a poll, 88% of 845 surveyed adults said that pesticides are "very harmful". What is the actual number
of adults who said that pesticides are "very harmful"? 1). Among the 845 surveyed adults, 650 said that pesticides are "not at all harmﬁll". What is the percentage
of people who chose "not at all harmful"? a. What is the actual number of adults who said that pesticides are "very harmful"?
744 (Round to the nearest integer as needed.) I}. What is the percentage of people who chose "not at all hannﬁil"? 7.6.9‘% (Round to the nearest tenth as needed.) YOU ANSWERED: 77 g_ A quality control engineer selects the ﬁrst 1500 hairdryers that are produced. Does this sampling plan
result in a random sample? Simple random sample? Does this sampling plan result in a random sample? 7* A. No, because each item does not have an equal chance of being selected.
9‘ B. No, because each group of n items does not have an equal chance of being selected.
i C. Yes, because each group of 11 items has an equal chance of being selected. if; D. Yes, because each item has an equal chance of being selected. Does this sampling plan result in a simple random sample? :.:.*A. Yes, because each group of 11 items has an equal chance of being selected.
2* B. No, because each group of 11 items does not have an equal chance of being selected.
c: _. C. No, because each item does not have an equal chance of being selected. {at D. Yes, because each item has an equal chance of being selected. YOU ANSWERED: B
D Page 4 Student: Grady Silnonton Instructor: Shawn Parvini Assignment: Chapter lA
Submitted: 02/18/10 2:16pm Course: Matl1119: Elementary Statistics  Spring 2010  CRN: 49239  16 weeks
Book: Triola: Elementaiy Statistics, 11e 9_ Determine whether the value is from a discrete or continuous data set. Number of coins in a jar is 78 Is the value from a discrete or continuous data set? Continuous .3! Discrete 10_ Identify the type of sampling used: random, systematic, convenience, stratiﬁed, or cluster. To estimate the percentage of defects in a recent manufacturing batch, a quality control manager at Toyota
selects every 18th car that comes off the assembly line starting with the tenth until she obtains a sample of
70 cars. Which type of sampling is used? 41*. A. Systematic
’__B. Stratiﬁed
'L'C. Cluster D. Convenience .33! E. Random YOU ANSWERED: E 11_ Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. Ages ofchildren: 5, 6, 'i‘, 8, and 9 Choose the correct answer below. Nominal
Interval
C!" Ratio ‘ . Ordinal Page 5 Student: Grady Silnonton Instructor: Shawn Parvini Assignment: Chapter lA
Submitted: 02/18/10 2:16pm Course: Mathll9: Elementary Statistics  Spring 2010  CRN: 49239  16 weeks
Book: Triola: Elementaiy Statistics, 11e 12_ Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate.
Ranks of scores in a tournament
Choose the correct level of measurement.
Ck A. Ordinal
i B. Nominal
ix C. Interval
if  D. Ratio
YOU ANSWERED: C
13_ Why is a voluntary response sample generally unsuitable for methods of statistics?
Choose the correct answer below.
[9A. Samples are likely to be far too large, so conclusions should not be made.
B. Samples are likely to be far too small, so conclusions should not be made.
a! C. People with special interests are more likely to respond, so the sample is likely to be biased.
D. People likely to respond are targeted by the researchers, so the sample is likely to be biased.
14_ Determine whether the given value is a statistic or a parameter. A sample of employees is selected and it is found that 65% own a vehicle. Choose the correct statement below. Statistic because the value is a numerical measurement describing a characteristic of a population. Parameter because the value is a numerical measurement describing a characteristic of a population. Parameter because the value is a numerical measurement describing a characteristic of a sample. 4ng Statistic because the value is a numerical measurement describing a characteristic of a sample. Page 6 Student: Grady Silnonton Instructor: Shawn Parvini Assignment: Chapter lA
Submitted: 02/18/10 2:16pm Course: Matl1119: Elementary Statistics  Spring 2010  CRN: 49239  16 weeks
Book: Triola: Elementaiy Statistics, 11e 15_ Determine whether the given description corresponds to an observational study or an experiment. In a study of 41';' men with a particular disease, the subjects were asked about their diet. Does the given description correspond to an observational study or an experiment? :_:_.IA. The given description corresponds to an experiment
.‘I! B. The given description corresponds to an observational study. ,9! C. The given description does not provide enough information to answer this question. YOU ANSWERED: C 16, Use common sense to determine whether the given event is either impossible, possible but very unlikely, or
possible and likely.
You rolled a pair of six sided dice and got a total of 16. Choose the correct answer below. Possible, but very unlikely
Possible and likely C!" Impossible 11 A statistical abstract includes the averageper capita income for each of 40 states. When those 40 values are added, then divided by 40, the result is $29,234.75. Is $29,234.75 the average per capita income for all
individuals in the 40 states? Why or why not? Choose the correct answer below. fl A. No, because population sizes are not taken into account.
cf . B. No, because not all states are taken into account. " C. Yes, because the calculated value is an average of each state average. :9; D. Yes, because everyone in the population is taken into account. YOU ANSWERED: D Page 7 Student: Grady Silnonton Instructor: Shawn Parvini Assignment: Chapter lA
Submitted: 02/18/10 2:16pm Course: Matl1119: Elementary Statistics  Spring 2010  CRN: 49239  16 weeks
Book: Triola: Elementaiy Statistics, 11e 18_ What is a voluntary response sample?
Choose the correct answer below.
A. A sample in which the sample size is very large.
B. A sample in which the researchers decide which subjects to include in the study.
'9‘" C. A sample in which the subjects themselves decide whether to be included in the study. ID. A sample in which the response "No Opinion" or "Not Applicable" are choices. 19_ An author wrote a book about bilingualism in America. Her conclusions were based on 5,633 replies
received after mailing 62,624 questionnaires. Are her conclusions likely to be valid in the sense that they can be applied to the general population? Why
or why not? ;'__I A. Yes, enough responses were received to make valid conclusions.
1'} B. No, not enough responses were received to make valid conclusions.
C: 'C. Yes, the numbers were precise. g.“ D. No, it was a voluntary response sample. Page 8 Student: Grady Simonton Instructor: Shawn Parvini Assignment: Chapter lA
Submitted: 02/18/10 2:16pm Course: Matl1119: Elementary Statistics  20. Spring 2010  CRN: 49239  16 weeks
Book: Triola: Elementaiy Statistics, 11e Some people responded to this request: "Dial 1900PROLIFE to participate in a telephone poll on
abortion. ($3.95 per minute. Average call: 3 minutes. You must be 19 years old.)" Identify the (a) sample
and (b) population. Also, determine whether the sample is likely to be representative of the population. a. Identify the sample. Choose the correct answer below. 5; ‘A. The sample is a nonrandomly selected group from all individuals who responded.
a"! B. The sample is all individuals who lcnew about abortion and were at least 19 years of age.
* C. The sample is all individuals who responded. 5;  D. The sample is a randomly selected group from all individuals who responded. b. Identify the population. Choose the correct answer below. A. The population is all individuals with opinions about the abortion issue.
B. The population is all individuals regardless of their age.
{ C. The population is all individuals who knew about the poll. it.“ D. The population is all individuals who are at least 19 years of age. Is the sample likely to be representative of the population? .jJ'L' A. No, the sample is not likely to be representative of the population because those with strong
opinions about abortion are more likely to respond. ":38. Yes, the sample is likely to be representative of the population because those who respond are not
likely to be biased. a"! C. No, the sample is not likely to be representative of the population because not all individuals Within
the population are likely to respond. ._': 'D. Yes, the sample is likely to be representative of the population because any individual within the
population can respond. YOU ANSWERED: B
C Page 9 ...
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