Answered: In 2014, the variance of the ages of…

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter13: Probability And Calculus

Section13.2: Expected Value And Variance Of Continuous Random Variables

Problem 10E

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In 2014, the variance of the ages of all workers at a large company that has more than 30,000 employees was 133. A recent random sample of 25 workers selected from this company showed that the variance of their ages is 112. Using a 2.5% significance level, can you conclude that the current variance of the ages of workers at this company is lower than 133?

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