From the following
Minitab output, what can be concluded regarding the difference in the mean PO
2 levels for the two populations?
a.The control and treatment groups are not significantly different at the
significance level.
b.The control and treatment groups are not significantly different at the
significance level.
c.The mean of the control group is significantly higher than the mean of the treatment group at the
significance level.
d.The mean of the control group is significantly lower than the mean of the treatment group at the
significance level.
Q. 2 What are the number of degrees of freedom for the pooled estimator
if
n1 = 30 and
n2 = 40?
a.10
b.40
c.68
d.30
Q. 3 Suppose a 95 confidence interval for the difference between the average age of females employed by Company A and the average age of females employed by Company B is (-4.7,6.5). Which of the following hypotheses can be tested at the
level using the information given?
a.H
0:
versus H
a:
b.H
0:
versus H
a:
c.H
0:
versus H
a:
d.H0: 
versus Ha: 
Q. 4 If two independent random samples gave the following information, what are the estimated mean and standard error for the difference between the two means under the assumption of equal variances?
Sample A: nA = 10, 
, sA = 15
Sample B: nB = 20, 
, sB = 10
a.The mean is 40 and the standard error is 11.84.
b.The mean is 200 and the standard error is 12.5.
c.The mean is 200 and the standard error is 4.59.
d.The mean is 40 and the standard error is 4.59.
Q. 5In a study of whether or not a new weight loss plan is effective, the weight of individuals before the weight loss plan is started and the weights of the same individuals after six weeks is recorded. What is the test statistic for testing the hypothesis that the weight loss plan is not effective given
n = 20,
, and
sd = 3.50?
a.
t = 15.97
b.
t = 12.5
c.It depends on the value for
which is not given.
d.
t = 0
Q. 6 What can be concluded from the following
Minitab output of the paired data in a study of how a set of students performs on the final exam in each of two classes?
a.There is a statistically significant difference between how the students perform on the finals in Class 101 and Class 201 at the
level.
b.Since the mean difference is -2.50 we can conclude that students perform better on the final for Class 201 than they do for Class 101 at the
level.
c.There is no statistically significant difference between how the students perform on the finals in Class 101 and Class 201 at the
level.
d.There is no statistically significant difference between how the students perform on the finals in Class 101 and Class 201 at the
level.
Q. 7Which of the following is
not true with regards to the distribution of the difference between two population means when the samples used are dependent?
a.The sampling distribution of
under the assumption of normality will have a mean
and standard deviation
.
b.The distribution will be centered at 0.
c.If the paired observations are randomly selected from normal populations, then the paired difference will be approximately normally distributed.
d.The paired difference is defined as
di =
xi -
yi.
Q. 8 What is the mean of the paired data in the following table that studied how a set of students performed on the final exam in each of two classes?
a.The mean of the paired data is 80.75.
b.The mean of the paired data is -2.50.
c.The mean of the paired data is 79.5.
d.The mean of the paired data is 82.
Q. 9 Which of the following is the correct multiplier for computing a
confidence interval for
?
a.
b.
c.
d.
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