In a Harris Poll of 514 human resources professionals, 90% said that the appearance of a job applica

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In a Harris Poll of 514 human resources professionals, 90% said that the appearance of a job applicant is the most important for a good first impression. Construct a 99% confidence interval estimate of a proportion of all the human resources professionals believing that the appearance of a job applicant is most important for a good first impression. How do you do this and what would be the answer?