Question: 7.5.17 (Computer exercise) Refer to Exercise 7.S.15. (a) Construct a 95% confidence interval for the difference in population means. (b) Suppose the investigators believe that

7.5.17 (Computer exercise) Refer to Exercise 7.S.15.

(a) Construct a 95% confidence interval for the difference in population means.

(b) Suppose the investigators believe that the effect of the low-chromium diet is "unimportant" if it shifts mean GITH activity by less than 15%-that is, if the population mean difference is less than about 8000 cpm/gm. According to the confidence interval of part (a), do the data support the conclusion that the difference is "unimportant"?

(c) How would you answer the question in part

(b) if the criterion were 4000 rather than 8000 cpm/gm?

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