A survey of 2311 adults in a certain large country aged 18 and older conducted by a reputable polling organization found that

409 have donated blood in the past two years. Complete parts (a) through (c) below.

(a) Obtain a point estimate for the population proportion of adults in the country 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 and interpret a90% confidence interval for the population proportion of adults in the country who have donated blood in the past two years. Select the correct choice below and fill in any answer boxes within your choice.