Question

Kelly wanted to investigate stress levels among college students. Specifically, she wanted to know if freshmen and seniors experienced different levels of stress. She asked 12 freshmen

and 12 seniors to complete a survey designed to measure stress levels. Scores on the stress survey were normally distributed and measured on an interval scale where higher

numbers indicate greater levels of stress. Choose the appropriate test statistic. Use α = .05. The data are as follows:

Freshmen: 20, 43, 56, 76, 45, 87, 12, 34, 65, 58, 42, 100

Seniors: 90, 30, 80, 60, 64, 37, 84, 27, 87, 54, 38, 92

Q26 Locate the critical region. ****** answer is not B*****

A. reject H0 if test statistic > 2.064 or test statistic < −2.064

B. reject H0 if test statistic > 2.201 or test statistic < −2.201

C. reject H0 if test statistic > 2.074 or test statistic < −2.074

D. reject H0 if test statistic > 1.717 or test statistic < −1.717

Q29 Compute the effect size for this study. *** answer is not B***

A. −0.85

B. −0.10

C. −0.89

D. −0.35

Answer 1

effect size =

where Sp= pooled sd=

it is 2 tail because our claim is to find the "difference" between stress level of freshmen and senior