6.16 Inference based on integer values. Refer to Exercise 6.13. The data for this study are integer values between 1 and 10. Explain why the confidence interval based on the Normal distribution will be a good approximation.
6.17 Mean serum TRAP in young women. For many deviation is known to be 19.6 ng/ml. Report the 95% confidence interval.
6.19 Populations sampled and margins of error. Consider the following two scenarios.
(A) Take a simple random sample of 100 sophomore students at your college or university.
(B) Take a simple random sample of 100 sophomore students in your major at your college or university. For each of these samples you will record the amount spent on textbooks used for classes during the fall semester. Which sample should have the smaller margin of error? Explain your answer.