Have you ever negotiated a pay raise? According to an Accenture survey

Have you ever negotiated a pay raise? According to an
Accenture survey, 52% of U.S. workers have (1. Yang and
K. Carter, “Have You Ever Negotiated a Pay Raise?”,
“Snapshots,” w”\’W.usatoday.com, May 22, 2009).
a. Suppose that the survey had a sample size of n 500.
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