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A researcher wishes to? estimate, with 90?% ?confidence, the population proportion of adults who say chocolate...

A researcher wishes to? estimate, with 90?% ?confidence, the population proportion of adults who say chocolate is their favorite ice cream flavor. Her estimate must be accurate within 5?% of the population proportion. ?(a) No preliminary estimate is available. Find the minimum sample size needed. ?(b) Find the minimum sample size? needed, using a prior study that found that 36?% of the respondents said their favorite flavor of ice cream is chocolate. ?(c) Compare the results from parts? (a) and? (b).

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