n a Harris poll of 514 human resource professionals, 90% said that the appearance of a job applicant is most important for a good first impression. (a) Among the 514 human resource professionals who were surveyed, how many of them said that the appearance of a job applicant is most important for a good first impression? (b) Construct a 99% confidence interval estimate of the proportion of all human resource professionals believing that the appearance of a job applicant is most important for a good first impression. (c) Repeat part (b) using a confidence level of 80%. (d) Compare the confidence levels from parts (b) and (c) and identify the interval that is wider. Why is it wider