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. Round to 4 decimal places.

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B) Construct a 90% confidence interval for the population proportion of adult Americans who have donated blood in the past two years. Round to 5 decimal places.