   Chapter 3, Problem 19P Essentials of Statistics for the B...

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

Solutions

Chapter
Section Essentials of Statistics for the B...

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

A sample of n = 9 scores has a mean of M = 20. One of the scores is changed and the new mean is found to be M = 22. If the changed score was originally X = 7, what is its new value?

To determine

To Find: The value of the new changed score.

Explanation

Given info:

A sample of 9 scores has a mean 20. The new mean after changing a score x=7 is 22.

Calculations:

The formula for the mean is:

M=XnX=M×n

Substitute M=20 and n=9 in the formula

X=20×9=180

Let the value of new score changed be x instead of original value 7

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