   Chapter 3.2, Problem 4LC 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 = 6 scores has a mean of M = 40. One new score is added to the sample and the new mean is found to be M = 35. What can you conclude about the value of the new score? a. It must be greater 40. b. It must be less than 40.

To determine

To Find: The value of new score when a new score is added such that new mean changes from 40 to 35.

Explanation

Given info:

A sample of 6 scores has mean 40. A new score is added, and the new mean becomes 35.

Calculation:

Reason for correct answer:

Formula for sample mean is:

M=XnX=M×n

Compute X in the original case (That is, without adding a score)

Xor

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