   Chapter 15, Problem 2P 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

Güven, Elaimis, Binokay, and Tan (2003) studied the distribution of paw preferences in rats using a computerized food-reaching test. For a sample of n = 144 rats, they found 104 right-handed animals. Is this significantly different from what would be expected if right- and left-handed rats are equally common in the population? Test with α = .01.

To determine
Whether it is significantly different from what would be expected if right and left handed rats are equally common in the population.

Explanation

Given info:

Given n=144,α=0.01

Calculation:

 Right handed rats Left handed rats 104 40

Null hypothesis H0: In the given population of rats there is no preferences between right handed and left-handed rats.

 Right handed rats Left handed rats 50% 50%

Alternative hypothesis H1: In the given population of rats preferences is taken

Use α=0.01

For critical region the value of freedom is

df=C1=21=1

As df=1 and α=0.01 from the table of critical values of chi-square critical value of χ2 is 6.63

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