Express the alternative hypothesis in symbolic form a

Express the alternative hypothesis in symbolic form.
A professor claims that the mean amount of time (in hours) sophomores spent studying for the statistics final exam is more
than that of freshmen. Assume that the two samples are independent. Let the freshmen be the first population and the
sophomores be the second population.
A. : H
1 1
=
B. : H
1 1
>
C. : H
1 1
≠
D. : H
1 1
<
2
2
2
2
Express the alternative hypothesis in symbolic form.
An automobile technician claims that the mean amount of time (in hours) per domestic car repair is more than that of
foreign cars. Assume that two samples are independent. Let the domestic car repair times be the first population and the
foreign car repair times be the second population.
2
2
2
2

9/26/2020 Module 7 Homework: Textbook Chapter 8 and Chapter -joseph gogue
19. Assume that you want to test the claim that the paired sample data come from a population for which the mean difference
is 0. Compute the value of the t test statistic. Round intermediate calculations to four decimal places as needed and
final answers to three decimal places as needed.
d
=
Subject A B C D E F
Before 168 180 157 132 202 124 190
After 162 178 145 125 171 126 180
G H I
210 171
195 163
6/8
20.
is 0. Compute the value of the t test statistics. Round intermediate calculations to four decimal places as needed and
final answers to three decimal places as needed.
d
=
x 9 6 7
y 6 8 3
A. t 1.292 =
B. t 2.890 =
C. t 0.415 =
D. t 0.578 =
Determine the decision criterion for rejecting the null hypothesis in the given hypothesis test; i.e., describe the values of
the test statistic that would result in rejection of the null hypothesis. Suppose you wish to test the claim that , the mean
value of the differences d for a population of paired data, is greater than 0. Given a sample of n 15 and a significance
level of 0.01, what criterion would be used for rejecting the null hypothesis?
d
=
=
21.
Assume that you want to test the claim that the paired sample data come from a population for which the mean difference
is 0. Compute the value of the t test statistics. Round intermediate calculations to four decimal places as needed and
final answers to three decimal places as needed.
d
=
x 9 6 7
y 6 8 3
A. t 1.292 =
B. t 2.890 =
C. t 0.415 =
D. t 0.578 =
Determine the decision criterion for rejecting the null hypothesis in the given hypothesis test; i.e., describe the values of
the test statistic that would result in rejection of the null hypothesis. Suppose you wish to test the claim that , the mean
value of the differences d for a population of paired data, is greater than 0. Given a sample of n 15 and a significance
level of 0.01, what criterion would be used for rejecting the null hypothesis?
d
=
=
5 12
6 7
−

9/26/2020 Module 7 Homework: Textbook Chapter 8 and Chapter -joseph gogue
7/8