W3 Moving on to Chi-Square

# W3 Moving on to Chi-Square - have the same hypothesis set...

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Moving on to Chi-Square Class, after two weeks of z and t we sometimes want to use them for everything else. But with chi-square, we are moving on to something new and different. There are several keys we look for in determining that it is a chi-square test. Note in chi-square we are given 3 or more "categories" in which each have a number of “observed” frequencies. We are asking (through the hypothesis set up) if there is a difference or no difference in the categories. Look carefully in the two lectures this week on how the hypothesis set up is formed. This is much different than the z and t hypothesis set ups. The chi-square problems (exercises) will ALL
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Unformatted text preview: have the same hypothesis set up. In completing the chi-square test statistic we will compare these observed frequencies to an expected set of frequencies. Of course, again, we will use a level of significance to apply in our testing process. In chi-square, however, we use a different table to determine the critical value, Appendix E, Chi-Square Critical Values. So chi-square uses the same five step process we studied with the z and t, though the hypothesis set up is worded differently and the decision rule will use a different table. In this course we will focus only on the Goodness of Fit: Test: Equal Expected Frequencies....
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## This note was uploaded on 10/10/2010 for the course STATS Stats301 taught by Professor Regis during the Spring '10 term at DeVry Irvine.

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