5. Sample Size You have been hired by a consortium of dairy farmers to conduct a survey about the consumption of milk.

a. If you want to estimate the percentage of adults who drink milk daily, how many adults must you survey if you want 95% confidence that your sample percentage is in error by no more than two percentage points?

b. If you want to estimate the mean amount of milk consumed daily by adults, how many adults must you survey if you want 95% confidence that your sample mean is in error by no more than 0.5 oz? (Based on results from a pilot study, assume that oz.)

c. If you plan to obtain the estimates described in parts

(a) and

(b) with a single survey having several questions, how many people must be surveyed?