A survey of 2310 adults in a certain large country aged 18 and older conducted by a reputable polling organization found that 427 have donated blood in the past two ork years. Complete parts (a) through (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: (Round to three decimal places as needed.) (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 ascending order.) O A. 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 O B. There is a % chance the proportion of adults in the country aged 18 and older who have donated blood in the past two years is between and to usines