Phstat output needed, show your work. The manager of a bank that has 1,000 depositors wants you to estimate the proportion of its depositors with more than one account at the bank. A random sample of 100 depositors is selected, and 30 state that they have more than one account at the bank.

1. Construct a 90% confidence interval estimate of the population proportion of the bank's depositors who have more than one account at the bank.

1. Interpret the interval estimate.

1. Given the margin of error in (a), what sample size is needed to estimate the population proportion to within with 90% confidence?