A personnel manager has found that historically the scores on aptitude tests given to applicants for entry level positions follow a normal distribution with a standard deviation of 32 4 points A random sample of nine test scores from the current group of applicants had a mean score of 187 9 points ...

a 80 confidence interval 18 ...

A personnel manager has found that historically the scores on aptitude tests given to applicants for entry

Question:

A personnel manager has found that historically the scores on aptitude tests given to applicants for entry level positions follow a normal with a standard deviation of 32.4 points. A random sample of nine test scores from the current group of applicants had a mean score of 187.9 points.
a. Find an 80% confidence interval for the population mean score of the current group of applicants.
b. Based on these sample results, a statistician found for the population mean a confidence interval extending from 165.8 to 210.0 points. Find the confidence level of this interval. Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...