Q1
a. Using a software package of your choice, develop a scatterplot and determine whether a linear relationship provides a good fit to this data set.
b. Using a software package of your choice, report the regression analysis results
Ans.
A. Scatter plot
For the following questions, you can use the SET command to enter the data, the CORR command to calculate correlation coefficients, and the REGR
command to do the regression. Type HELP SET , HELP CORR or HELP REGR for information on how to use these comma
Q2
A biologist is planning an experiment to assess the proportion of Pollock in the diet of northern fur seals. She wants to get an idea of the expected properties
of the survey
before undertaking it.
(a) How many fur seals must be sampled to ensure that
Q1
To compare the treatment effect of two medications, two independent samples of patient performance data were collected. Assuming that the two populations
shared the same variance, the researchers decided to conduct a two independent samples test for th
Q1
When you are testing the difference between two means, it is not important to distinguish whether the samples are independent of each other. False explain
why?
A.
False, It is Important to assume both samples are independent. We use below 3 assumptions
Q1
Based on a sample of 50 x-values having mean 35.36 and standard deviation 4.26,
(a)
test at the 0.05 level of significance the null hypothesis : = 34 versus the alternative : 34.
(b)
find a 95% confidence interval for the population mean.
(c)
determine
Question#24,Chapter2
The following frequency distribution presents a set of exam scores for a class of N = 20 students.
x
90-99
80-89
70-79
60-69
50-59
f
4
7
4
3
2
a.
b.
c.
d.
cf
20
16
9
5
2
C%
100
80
45
25
10
find the 30th percentile.
Find the 88th perce
Q1
No error is committed when the null hypothesis is rejected when it is false
A. True, reason definition of TYPE I error gives reject Ho when It is true, it works when error is committed and for no error it is false
Q3
The test value separates the critic
Q1
Sixty percent of patients undergoing a certain hospital procedure are expected to require an overnight stay. The hospital schedules 8 patients for this
procedure each day. They set aside 6 beds to accommodate expected overnight stays for these patients
Data from Table Splitting for each year
Excelformulas
ForSum:
SUMIFS(B2:B2151,C2:C2151,"2002")
SUMIFS(B2:B2151,C2:C2151,"2003")
Likewise till SUMIFS(B2:B2151,C2:C2151,"2011")
ForCount :
COUNTIF($C$2:$C$2151,"2002")
COUNTIF($C$2:$C$2151,"2003")
Likewise t
Q1
Some insurance companies claim that the rate of serious and fatal accidents is higher when the car size is smaller, and therefore question the policy of
offering reduced rates to owners of small cars. To investigate this, a researcher analysed a sample
Q1
For the following set of data, find the range and the interquartile range. Label each answer
with the appropriate term. Scores: 3, 2, 6, 4, 5, 3, 1, 6
ANS
Range = Maximum Minimum
Maximum value in list = 6
Minimum value in list = 1
Range = Maximum Minim
Q1
1.) A radio station that plays classical music has a "by request" PROGRAM each Saturday evening. The percentages of requests for composers on a
particular night are as
follows.
Bach
19%
Beethoven
12%
Brahms
8%
Dvorak
3%
Mendelssohn
7%
Mozart
17%
Schube
Q1
The conductivity of fibrous-glass board. How well materials conduct heat matters when designing houses, for example. Conductivity is measured
in terms of watts of heat power transmitted per square meter of surface per degree Celsius of temperature diff
Please show all work. Include formulas, calculations, or definitions necessary to solve the problems. I recommend that you use Excel. You may also use Word, but must attach the Excel
workbook used for calculations or paste the work in the document. Feel f
When calculating the standard deviation and variance from a sample, which of the following is the
denominator for the biased estimate of the population standard deviation and the biased estimate
of the population variance? ( Point)
N
N1
N+1
N2
N+2
Answer)
Q1
Explaining confidence. A student reads that a 95% confidence interval for the mean ideal weight given by adult American women is 140 1.4 pounds. Asked
to explain the meaning of this interval, the student says, 95% of all adult American women would say
Q1
Ans.
A.
i.
Mean = Sum of the observations / No.of the observations
Here n = 20 ; Sum of the observations = 127
Mean = 127/20 = 6.35
ii.
Median is the middle observation. If N is odd, use the formula (N+1)/2 th observation. If it is even use the formula
Q1
A population has = 80 and = 12. Find the z statistic corresponding M = 84 for a sample if n = 5. MY ANSWER: I got z = .75. Is this correct?
Ans.
Test Used: Z-Test For Single Mean
Set Up Hypothesis
Null Hypothesis H0: U=80
Alternate Hypothesis H1: U!=80
East Brunswick High school has 1600 students. A sample of 160 students was selected to study
the average monthly income of students. Since sample size is greater than 30, how much error
would you expect in finding the average income of all students?
a) 5
Q1
A.
To find P(a < Z < b) = F(b) - F(a)
P(X < 0.03) = (0.03-0)/1
= 0.03/1 = 0.03
= P ( Z <0.03) From Standard Normal Table
= 0.51197
P(X < 1.01) = (1.01-0)/1
= 1.01/1 = 1.01
= P ( Z <1.01) From Standard Normal Table
= 0.84375
P(0.03 < X < 1.01) = 0.84375