11 - 4/18/11 Chi Square o Simple test allows you to test...

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4/18/11 Chi Square o Simple test allows you to test whether what you observe in a distribution of frequencies (nominal data) is by chance o Chance usually assumes equal frequencies in each group o Chance is the null o There are no differences in the proportion of men and women majoring in engineering Or majoring in fashion design, etc. Equation o X^2=SUM of (O-E)^2/E O= Observed freq. E= Expected freq. by chance Compute the difference between each observed and expected value Square, then divide by E Sum those up and look at Table B5 Df= number of groups (options or choices-1) Example o Observe 210 men and 67 women majoring in engineering o Are significantly more men majoring in engineering than women Computing Find expected (210+67)/2+138.5 Compute for difference squared then divide by E for each 210-138.5=71.5 5,112.25 36.91 67-138.8=-71.7 5,112.25 36.91 o Only the same cuz there are only 2 groups Sum together
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11 - 4/18/11 Chi Square o Simple test allows you to test...

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