Question: In a survey of 1037 adults from the United States age 65 and over, 643 were concerned about getting the flu

(a) Find a point estimate for the population proportion p of those concerned about getting the flu.

(b) Construct a 90% confidence interval for the population proportion.

(c) Find the minimum sample size needed to estimate the population proportion at the 99% confidence level in order to ensure that the estimate is accurate within 4% of the population proportion.