ch. 13_111610 - Discussion section 227 Chapter 12 Chi...

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11/16/10 Chapter 12 – Chi Square One-variable Chi Square (goodness of fit) This test statistic is used when we have one variable that is measured on a nominal scale. The variable usually consists of several categories We are not comparing means in this case but frequencies – the number of people that endorse a particular category Expected frequency : the hypothesized frequency for each category, given that the null hypothesis is true. Observed frequency : the obtained frequency for each category Example: A random sample of 30 students indicates whether they most desire love, health, or power. Using a 0.05 level of significance, test the null hypothesis that in the underlying population the various qualities are equally popular. Quality Love Health Power Total Observed (f o ) 16 9 5 30 Step 1: H o : In the underlying population, Students endorse the different qualities equally H 1 : H o is false Step 2: df = C-1 where C is the number of categories. df = 3-1 = 2
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This note was uploaded on 02/21/2012 for the course PYSC 227 taught by Professor Fairchild during the Fall '10 term at South Carolina.

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ch. 13_111610 - Discussion section 227 Chapter 12 Chi...

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