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Unformatted text preview: The chisquare statistic is a measure of how far the observed counts in a twoway table are from the expected counts. The formula for the statistic is The chisquare statistic is a sum of terms, one for each cell in the table. Cell counts required for the Chisquared test: You can safely use the chisquare test with critical values from the chisquare distribution when no more than 20% of the expected counts are less than 5 and all individual expected counts are 1 or greater. In particular, all four expected counts in a 2 2 table should be 5 or greater. The expected counts are the counts we expect if all the proportions are equal. A large chisquare test statistic supports the alternative hypothesis. Check conditions: 1. SRS or random allocation 2. All expected counts>=5...
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This note was uploaded on 02/27/2012 for the course STAT 121 taught by Professor Patticolling during the Winter '11 term at BYU.
 Winter '11
 PattiColling

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