Do you use the same password for all your social networking sites? A recent survey (USA Today, July 22, 2010, p. IB) found that 32% of social network users use the same password for all their social networking sites.
a. To conduct a follow up study that would provide 99% confidence that the point estimate is correct to within ±0.03 of the population proportion, how many people need to be sampled?
b. To conduct a follow up study that would provide 99% confidence that the point estimate is correct to within ±0.05 of the population proportion, how many people need to be sampled?
c. Compare the results of (a) and (b).