In a Harris poll of 514 human resource professionals, 45.9% said body piercings and tattoos were big grooming redflags.
a. Among the 514 human resource professionals who were surveyed, how many of them said body piercings and tattoos were big grooming redflags?
b. Construct a 99% confidence interval estimate of the proportion of all human resource professionals believing body piercings and tattoos are big grooming redflags.
c. Repeat part (b) using a confidence level of 80%.
d. Compare the confidence intervals from parts (b) and (c) and identify the interval is wider. Why is it wider?