1..A survey of 2285 adults in a certain large country aged 18 and older conducted by a reputable polling organization found that 421 have donated blood in the past two years. Complete parts(a) and(b) 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=. ??

(b) 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 your 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 ________nothing

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 _______

.