Have you ever negotiated a pay raise? According to an Accenture survey, 52% of U.S. workers have

Question:

Have you ever negotiated a pay raise? According to an Accenture survey, 52% of U.S. workers have (J.Yang and K. Carter, "HaveYou Ever Negotiated a Pay Raise?" www. usatoday.com, May 22, 2009).
a. Suppose that the survey had a sample size of Construct a 95% confidence interval for the proportion of all U.S. workers who have negotiated a pay raise.
b. Based on (a), can you claim that more than half of all U.S. workers have negotiated a pay raise?
c. Repeat parts (a) and (b), assuming that the survey had a sample size of n = 5,000.
d. Discuss the effect of sample size on confidence interval estimation.