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
1. Compute the chosen test statistic.
A. −0.85
B. 10.35
C. 7.53
D. 2.01
2. Should you reject or fail to reject the null hypothesis?
A. reject
B. fail to reject
3. Compute the effect size for this study.
A. −0.85
B. −0.10
C. −0.89
D. −0.35
4. Which of the following is the best summary of the results?
A. Seniors report significantly more stress than freshmen.
B. Freshmen report significantly more stress than seniors.
C. There is no difference between the reported stress levels between freshmen and seniors.