Problems 7 and 8

T. In a Gallup poll of 514 human resource professionals, 85% said that the appearance of a job applicant is most important for a good first impression. Construct a 99% confidence interval (CI) and margin of error (ME) of the proportion of all human resource professionals believing that the appearance of a job applicant is most important for a good first impression. 8. Using a margin of error of $133, confidence level of 95% and standard deviation , find the minimum sample size required to estimate an unknown population mean