7.92 Consider the data in Exercise 7.90. It was reported in the local paper that almost two-thirds (from 57%

to 63%) of the population prefers the online renewal process. What is the confidence level of this interval estimate?

7.93 The county finance department in Exercise 7.90 also wants information about renewals of disabled parking placards. Suppose that in a sample of 430 transactions for disabled parking placards, it was found that 360 were paid electronically.

a. What is the margin of error for a 95% confidence interval estimate of the population proportion of disabled renewal transactions paid electronically?

b. Without calculating, is the margin of error for a 90% confidence interval estimate of the population proportion of disabled renewal transactions paid electronically larger, smaller, or the same as that found in part a for a 95% confidence interval?