A survey of 2306 adult Americans aged 18 and older conducted by Harris Interactive found that 417 have donated blood in the past two years.
(a) Obtain a point estimate for the population proportion of adult Americans aged 18 and older who have donated blood in the past two years.
(b) Verify that the requirements for constructing a confidence interval about p are satisfied.
(c) Construct a 90% confidence interval for the population proportion of adult Americans who have donated blood in the past two years.
(d) Interpret the interval?