For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding. In a marketing survey, a random sample of 990 supermarket shoppers...

(a)

Letp represent the proportion of all supermarket shoppers who always stock up on an item when they find a real bargain. Find a point estimate forp. (Enter a number. Round your answer to four decimal places.)

(b)

Find a 95% confidence interval forp. (For each answer, enter a number. Round your answers to three decimal places.)
lower limit
upper limit

What is the margin of error based on a 95% confidence interval? (Enter a number. Round your answer to three decimal places.)