personnel manager has found that historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 32.4 points. A random sample of 9 test scores from the current group of applicants had mean 187.9 points. a. Find a 80% confidence interval for the population mean score for the current group of applicants. b. Based on these sample results, a statistician found for the population mean a confidence interval running from 165.8 to 210.0 points. Find the probability content of this interval.
personnel manager has found that historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 32.4 points. A random sample of 9 test scores from the current group of applicants had mean 187.9 points. a. Find a 80% confidence interval for the population mean score for the current group of applicants. b. Based on these sample results, a statistician found for the population mean a confidence interval running from 165.8 to 210.0 points. Find the probability content of this interval.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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A personnel manager has found that historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 32.4 points. A random sample of 9 test scores from the current group of applicants had mean 187.9 points.
a. Find a 80% confidence interval for the population mean score for the current group of applicants.
b. Based on these sample results, a statistician found for the population mean a confidence interval running from 165.8 to 210.0 points. Find the probability content of this interval.
thank you very much.
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