Problems 5,6,7, and 8

5. To determine the average college students' annual earnings a random sample of 9 students is selected. Their mean earnings are $3605, and their standard deviation is . Construct the 98% confidence interval (CI) and margin of error (ME) for the mean annual earnings of all college students. 6. A survey of 865 voters in one state revealed that 408 favor approval of an issue before the legislature. Construct the 95% confidence interval (CI) and margin of error (ME) for the true proportion of all voters in the state who favor approval. 7. In a Gallup poll of 514 human resource professionals, 85% said that the appearance of ajob 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