A personnel manager has found that historically the scores on aptitude tests given two applicants for...

A personnel manager has found that historically the scores on aptitude tests given two applicants for entry level positions follow a normal distribution. A random sample of 19 test scores from the current group of applicants has a sample mean score of 187.9 points and a sample standard deviation as 32.4 points.

a. find the margin of error.

b. construct a confidence interval estimate for the population mean with 80% level of confidence.

c. construct a confidence interval estimate for population mean with 85% level of confidence.

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orchestra answered 1 year ago

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