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Expert-verified Found in: Page 426 ### Introductory Statistics

Book edition OER 2018
Author(s) Barbara Illowsky, Susan Dean
Pages 902 pages
ISBN 9781938168208 # What is the mean, standard deviation, and sample size?

The mean time for each review is$4$ hours and standard deviation is $1.2$ hours and sample size is$16.$

See the step by step solution

## Step 1:  Given information

Given in the question that, Yoonie is a personnel manager in a large corporation. Each month she must review $16$ of the employees. From past experience, she has found that the reviews take her approximately four hours each to do with a population standard deviation of $1.2$ hours. Let$Χ$ be the random variable representing the time it takes her to complete one review. Assume$Χ$is normally distributed. Let $\overline{x}$be the random variable representing the mean time to complete the $16$ reviews. Assume that the $16$ reviews represent a random set of reviews.

## Step 2: Explanation

According to the supplied facts, the manager reviews $16$ employees each month. And reviews time is approximately 4 hours for each review with a population standard deviation of $1.2$ hours. Thus, the meantime for each review is $4$ hours and the standard deviation is$1.2$ hours, and sample size is $16.$

The meantime for each review is $4$hours and the standard deviation is $1.2$ hours, and sample size is $16.$ ### Want to see more solutions like these? 