Analyze the following problem from Andy Field's Book and answer the questions below.

"To test how different teaching methods affected students' knowledge, I took three statistics courses where I taught the same material. For one course I wandered around with a large cane and beat anyone who asked daft questions or go questions wrong (punish). In the second I encouraged students to discuss things that they found difficult and gave anyone working hard a nice sweet (reward). For the final course, I remained indifferent and neither punished nor rewarded students' efforts (indifference). As the dependent measure, I took the students' percentage exam grades. These data are in Teach.sav."

1. Conduct an independent samples t-test to test the hypothesis that indifference will lead to significantly different exam results than punishment. Hint: there are three groups, but use Values labels in Variable View to determine which two groups you will be comparing and then specify these groups in the analysis window.
   1. What decision do you make about the hypothesis above? Which group had higher exam score? Explain how you came to the decision about the hypothesis.
   2. Was the equal variances assumption violated? Please explain your answer.
   3. Whatisthecriticalvalueforthisstatisticaltest?
   4. What is the point estimate for the confidence interval? How was this value computed?
   5. UseSPSSoutputtocomputeeffectsizeforthedifferencebetweenthetwogroups.
2. Conduct Oneway ANOVA on these teaching data to test the hypothesis that all the teaching methods will all produce different results. Be sure to test equality of variances, calculate effect size, and do a Bonferroni post-hoc test as part of this analysis.
   1. What is the between treatments df for this study?
   2. What is the within treatments df for this study?
   3. What is the critical value for F using alpha of .05?
   4. What is the within group variability (MS_within)?
   5. What is the obtained F value?
   6. Verify the F value in question 5 (above) by computing it by hand using other numbers from SPSS table (show your work or no credit for copying F value from SPSS output).
   7. Should the null hypothesis be rejected? Provide rationale for your decision.
   8. What is the effect size for this study? Interpret the effect size in words.
   9. Which groups were different from each other in post-hoc test? Hint: there were two significant differences.