Practice Problems (Chapters 9 and 11)
Chapter 9
1. Given a samplemean of 12.5 based on 25 cases and a population variance of 10,construct a 95% confidence interval for the population mean.Interpret the resulting interval.
2. What can beexpected to happen to the length of a confidence interval as thesize of the sample used to construct it increases. Explain.
3. In a shortparagraph, explain the logic of confidence intervals.
4. Can confidenceintervals be used to test hypotheses? Explain.
Chapter 11
5. Describe aresearch study appropriate for an independent measures t-test.
6. Describe aresearch study appropriate for a dependent samples t-test.
7. Consider thedata in problem 4 in Chapter 11 (p. 273). Enter these data intoSPSS and conduct a test of the null hypothesis. Compute a measureof effect size and construct a 95% confidence interval for yourstudy.
8. Consider thedata in problem 5 in Chapter 11 (p. 273). Enter these data intoSPSS and conduct a test of the null hypothesis. Compute a measureof effect size and construct a 95% confidence interval for yourstudy.
