8.88 We did not know the sample size. Refer to the previous two exercises. We did not report the sample size for the earlier study, but it is reasonable to assume that it is close to the sample size for the later study.

1. (a) Suppose that the sample size for the earlier study was only 800. Redo the confidence interval and significance test calculations for this scenario.

2. (b) Suppose that the sample size for the earlier study was 2500. Redo the confidence interval and significance test calculations for this scenario.

3. (c) Compare your results for parts (a) and (b) of this exercise with the results that you found in the previous two exercises. Write a short paragraph about the effects of assuming a value for the sample size on your conclusions.