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Chapter 9, Question 12.

Serum zinc levels

for 462 males between the ages of 15 and 17 are saved under the variable name zinc in the data set serzinc [13] (Appendix B, Table B.1). The units of measurement for serum zinc level are micrograms per deciliter

Mean 87.94

SD 16.005


(a) Find a two-sided 95 % confidence interval for  , the true mean serum zinc level

for this population of males .

(b) Interpret this confidence interval.

(c) Calculate a 90% confidence interval for .

(d) How does the 90% confidence interval compare to the 95 % interval?

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