Essentials of Statistics for the B...

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



Essentials of Statistics for the B...

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

A researcher has developed three different designs for a computer keyboard. A sample of n = 60 participants is obtained, and each individual tests all three keyboards and identifies his or her favorite. The frequency distribution of preferences is as follows:

Design A Design B Design C  
23 12 25 n = 60
  • a. What is the df value for the chi-square statistic?
  • b. Assuming that the null hypothesis states that there are no preferences among the three designs, find the expected frequencies for the chi-square test.


To determine
Degrees of freedom value for the chi-square statistic.


Given info:

For a computer keyboard, three different designs were developed by a researcher. A sample of size 60 were taken and obtained each individual tests for three keyboard and the favourite one was identified.


Degree of freedom is calculated by simply with relation.



To determine
Expected frequencies of the chi-square test.

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