   Chapter 3, Problem 17P 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 population of N = 8 scores has a mean of µ = 16. After one score is removed from the population, the new mean is found to be µ = 15. What is the value of the score that was removed? (Hint: Compare the values for ∑X before and after the score was removed.)

To determine

To Find: The value of new score which is removed from an original sample of 8 scores.

Explanation

Given info:

A sample of 8 scores has a mean 16. After a score is removed, the new mean is 15.

Calculation:

The formula for sum of scores can be derived from the mean:

μ=XNX=μ×N

Substitute μ=16,N=8 in the above formula. Then,

X=8×16=128

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