Practice Problems (Chapters 9 and 11) Chapter 9 1. Given a sample mean of 12.5 based on 25...

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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.

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1 Given sample mean 125sample size n 25 Population variance 1095 confidence interval for the population mean Z0025 19695CI 125196sqrt1025 125196sqrt1025 11260 137402 If the length of sample increases then the confidenceinterval length decreases because the margin of error decreases as the sample size is in the See Answer

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