(Solution) - You wish to estimate with 95 confidence the population proportion -(2025 Original AI-Free Solution)

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Academic Level: Undergrad. (yrs 3-4)

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You wish to estimate, with 95% confidence, the population proportion of U.S. adults who think that the president can do a lot about the price of gasoline. Your estimate must be accurate within 4% 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 48% of U.S. adults think the president can do a lot about the price of gasoline.
(c) Compare the results from parts (a) and (b).