The dean at a large university in California wonders if students study less than

Question

The dean at a large university in California wonders if students study less than an average of 24 hours per week.

She randomly selects 25 students and asks their average study time per week (in hours). From their responses, she calculates a sample mean of 19 hours and a sample standard deviation (ss) of 10 hours. Assume the study times are normally distributed.

Question 36

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Specify the null and alternative hypotheses.

Select one:

a. H(0): 24 Versus H(a): >24

b. H(0): 24 Versus H(a): <24

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Question 37

Question text

The standard error (SE) of   X¯X¯ is

Select one:

a. 2

b. 0.4

c. 10

d. 3.8

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Question 38

Not answered

Points out of 1.00

Question text

The test statistics value is

Select one:

a. -1.25

b. -1.67

c. -2.5

d. -2

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Question 39

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Question text

The p-value is

Select one:

a. 0.11

b. 0.05

c. 0.01

d. 0.03

Question 40

Not answered

Points out of 1.00

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At =0.05 and based on p-value

Select one:

a. We reject H(0) in favor of H(a)

b. We do not reject H(0)

Explanation / Answer

36)b. H(0): 24 Versus H(a): <24

37) The standard error (SE)=10/(25)1/2 =2

38)The test statistics value is =(X-mean)/std error =(19-24)/2=-2.5

39)The p-value is =0.01

40)We reject H(0) in favor of H(a)

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