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Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570

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Section
BuyFindarrow_forward

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570
Textbook Problem

A sample is selected from a population with a mean of μ = 90 and a standard deviation of σ = 15. Find the z-score for the sample mean for each of the following samples.

  • a. n = 9 scores with M = 100
  • b. n = 25 scores with M = 89

(a)

To determine

To find: The z-score for the sample mean.

Explanation

Given info:

A sample is selected from a population with a mean of μ=90 and standard deviation of σ=15. The sample size is n=9. The sample mean is M=100.

Calculation:

The formula for calculating the z-score:

z=Mμ

(b)

To determine

To find: The z-score for the sample mean.

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