What advertising medium gives a brand the most credibility in influencing brand decisions? According to an Adroit Digital survey, 35% of Millennials point to TV. (Source: “U. S. Millennials: TV is Most Influential Advertising Medium,” MC Marketing Charts, March 20, 2014.)

a. To conduct a follow-up study that would provide 95% confidence that the point estimate is correct to within ± 0.04 of the population proportion, how large a sample size is required?

b. To conduct a follow-up study that would provide 99% confidence that the point estimate is correct to within ± 0.04 of the population proportion, how many people need to be sampled?

c. To conduct a follow-up study that would provide 95% confidence that the point estimate is correct to within ± 0.02 of the population proportion, how large a sample size is required?

d. To conduct a follow-up study that would provide 99% confidence that the point estimate is correct to within ± 0.02 of the population proportion, how many people need to be sampled?

e. Discuss the effects on sample size requirements of changing the desired confidence level and the acceptable sampling error.