In a survey conducted for Money magazine by the ICR Survey Research Group, 26% of parents with collegebound high school children reported not having saved any money for college. The poll had a ". . . margin of error of plus or minus 4 percentage points" (Newark Star-Ledger, Aug. 16,1996).

a. Assume that random sampling was used in conducting the survey and that the researchers wanted to have 95% confidence in their results. Estimate the sample size used in the survey.

b. Repeat part

a, but this time assume the researchers wanted to be 99% confident.