   Chapter 3, Problem 20P 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

One sample of n = 12 scores has a mean of M = 7 and a second sample of n = 8 scores has a mean of M = 12. If the two samples are combined, what is the mean for the combined sample?

To determine

To Find: The mean of the combined sample

Explanation

Given info:

A sample of 12 scores has mean 7 while the second sample has 8 scores and a mean value 12.

Calculations:

Calculate sum of scores, X1 and X2 for the two samples as:

X1=n1×M1=12×7=84

Similarly,

X2=n2×M2=8×12=96

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