ch. 13_111610

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

This preview shows pages 1–2. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## 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.

### Page1 / 5

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online