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FYI: One-Way Chi-Square

FYI: One-Way Chi-Square. Eqn : df =I-1 Why/When? e.g., compare sample to population characteristics, or to previous study’s benchmark. One-Way Chi-Square: Example.

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FYI: One-Way Chi-Square

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  1. FYI: One-Way Chi-Square Eqn: df=I-1 Why/When? e.g., compare sample to population characteristics, or to previous study’s benchmark

  2. One-Way Chi-Square: Example • Example: <18 19-24 25-34 35-44...your data: oi’s: 5 10 20 15 n=50(pop proportions: 20% 24% 30% 26%)benchmark: ei’s: 10 12 15 13 • X2 = [(5-10)2/10] +[(10-12)2/12] +[(20-15)2/15] +[(15-13)2/13 = 2.5 + .333 + 1.667 +.308 = 4.808 (critical value on 3 df=7.82)

  3. The Case of the Blue M&M’s PLAIN PEANUTei’s oi’s ei’s oi’s blue brown green orange red yellow critical chi-square on 5 df = 11.07

  4. The Case of the Blue M&M’s:Does aggregating help? PLAIN PEANUTei’soi’sei’soi’s blue brown green orange red yellow

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