25. Suppose the U.S. president wants to estimate the proportion of the population that supports his current policy toward revisions in the health care system. The presi- dent wants the estimate to be...

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Extracted text: 25. Suppose the U.S. president wants to estimate the proportion of the population that supports his current policy toward revisions in the health care system. The presi- dent wants the estimate to be within .04 of the true proportion. Assume a 95% level of confidence. The president's political advisors found a similar survey from two years ago that reported that 60% of people supported health care revisions. a. How large of a sample is required? b. How large of a sample would be necessary if no estimate were available for the proportion supporting current policy?