Mug T-Shirt Toy Bottle 6 18 12 4 Calculate chi-square (χ2)     12     3     6.4     40

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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A fundraiser is offering a small gift to people making a donation.  The donor can choose one of four gifts: a mug, a t-shirt, a plush toy, or a water bottle.  The fundraiser would like to know if any of the gifts were more or less popular or were they equal in preference.  The data for n = 40 donors are below:

 

Mug T-Shirt Toy Bottle
6 18 12 4

Calculate chi-square (χ2)

   

12

   

3

   

6.4

   

40

 

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