A survey of 2281 adults in a certain large country aged 18 and older conducted by a reputable polling organization found that 401 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.

p=________

(Round to three decimal places asneeded.)

(b) Verify that the requirements for constructing a confidence interval about p are satisfied.

The sample _________(can be assumbed, can b assumed, is stated , is not stated) a simple randomsample, the value of (Formula)_____is ______, which is _________(less than, greater than or equal to) 10, and the (population size, population proportion, sample proportion, sample size)________is ________(stated to be, cannot be assumed to be, is stated to not be ,can be assumed to be)less than or equal to5% of the _____(population size, population proportion, sample proportion, sample size)

(Round to three decimal places asneeded.)

(c) Construct and interpret a 90% 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 a choice.

(Type integers or decimals rounded to three decimal places as needed. Use ascendingorder.)

A.

There is a _______% probability the proportion of adults in the country aged 18 and older who have donated blood in the past two years is between

______ and ______.

B.

We are _____% confident the proportion of adults in the country aged 18 and older who have donated blood in the past two years is between

_____and_____.