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Chi-Square Test for Independence

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StatisticsCommon Core DAT-3.BINFVerified correct โœ“

Worked examples

A two-way contingency table has 2 rows and 2 columns. The observed data are: Group A: 25 | 25 (total 50); Group B: 50 | 50 (total 100); Column totals: 75 | 75; Grand total: 150. Compute the chi-square test statistic ฯ‡ยฒ for independence.
Answer: 0
A two-way contingency table has 2 rows and 3 columns. The observed data are: Group A: 25 | 26 | 26 (total 77); Group B: 25 | 24 | 24 (total 73); Column totals: 50 | 50 | 50; Grand total: 150. Compute the chi-square test statistic ฯ‡ยฒ for independence.
Answer: 0.0534

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Chi-Square Goodness-of-Fit TestConditional Probability โ€” P(A|B) and Independence

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