Question: 11.67 Refer to Case Study 11.2 (pp. 445). a. Use the baseline data to find an approximate 95% confidence interval for the difference in means

11.67 Refer to Case Study 11.2 (pp. 445).

a. Use the baseline data to find an approximate 95% confidence interval for the difference in means for the populations represented by the placebo and calcium groups at the start of the study.

b. Explain why the researchers would want the interval computed in part

(a) to cover zero.

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