A drug has been developed that may reduce a person's cholesterol.
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A drug has been developed that may reduce a person's cholesterol. Investigators are interested in estimating the

amount by which the drug will reduce cholesterol, and in calculating a confidence interval. For each of the following, say whether the change will cause the confidence interval to get wider or get narrower:

(a) The investigators decide to enroll more people in the study

(b) More sophisticated lab techniques are used, allowing for more accurate measurement of cholesterol

(c) The investigators want a 99% confidence interval instead of a 95% confidence interval 

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(a) The investigators decide to enroll more people in the study: Narrower (b) More... View the full answer

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