COMM 215 Chapter Notes - Chapter 14: Chi-Squared Test, Chi-Squared Distribution, Null Hypothesis
7 Apr 2017
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Sometimes we collect count data to study how the counts are distributed among several categories or cells. We might want to study the consumer preferences for 4 different brands of a product. To do this, we randomly select a sample of consumers and ask each to indicate which brand they prefer. We often use categorical data to carry out a statistical inference. A microwave wholesaler in london carries 4 different brands. Past consumer behavior results in the market shares for london: The wholesaler wants to start doing business in edmonton. To see if they can use the same stocking policies in edmonton as they did in london, they compare consumer preferences for the 4 ovens. To compare consumer preferences in london & edmonton, we have to consider a multinomial experiment. A random sample of 400 consumer preferences are taken in edmonton: 4 (# of consumers who prefer the brand)
