1) What value of F is expected if the null hypothesis is true? Explain why in 3-4 sentences. (15)
2) Why are post hoc tests needed after a significant one-way ANOVA? (10)
For questions 3-5 on the one-way ANOVA, use the following data set. It reflects the scores of students on
worries about getting a job (0 = not at all worried to 10 = extremely worried). The students are divided into
three groups: sophomores, juniors, and seniors. Describe your work in SPSS, explaining what you did at each
step of the process.
Sophomores: 5, 2, 6, 5, 7, 3, 4, 4, 5, 2, 9, 7, 3, 4, 3, 6, 7, 7, 3, 6
Juniors: 3, 6, 8, 4, 7, 5, 6, 6, 4, 8, 8, 9, 4, 6, 3, 6, 10, 8, 8, 3
Seniors: 6, 4, 7, 9, 9, 2, 10, 6, 8, 5, 9, 9, 6, 3, 7, 9, 9, 10, 4, 6
3) For the above data set, enter the data into SPSS and do the one-way ANOVA. Interpret the overall F. (20)
4) Calculate and explain the results of the Tukey test, if needed. If not needed, explain why in 2-3 sentences.
(25)
5) Calculate and interpret the value of r squared. (10)
6) What are two reasons why correlation may not equal causation? (10)
7) In 2-3 sentences, briefly explain the problem of restricted range in correlation. (10)