In a random sample of 678 adult males 20 to 34 years of age, it was determined that 58 of them have hypertension (high blood pressure). Complete parts (a) through (d) below. (a) Obtain a point estimate for the proportion of adult males 20 to 34 years of age who have hypertension. A point estimate for the proportion is. (Round to three decimal places as needed.) (b) Construct a 95% confidence interval for the proportion of adult males 20 to 34 years of age who have hypertension. Interpret the confidence interval. that the proportion of who have hypertension is between ] and (Type integers or decimals rounded to three decimal places as needed. Use ascending order.) (c) You wish to conduct your own study to determine the proportion of adult males 20 to 34 years old who have hypertension. What sample size would be needed for the estimate to be within 3 percentage points with 95% confidence if you use the point estimate obtained in part (a)? (Round up to the nearest integer.) (d) You wish to conduct your own study to determine the proportion of adult males 20 to 34 years old who have hypertension. What sample size would be needed for the estimate to be within 3 percentage points with 95% confidence if you don't have a prior estimate? (Round up to the nearest integer.)