chapter 15 - Chi Square Tests

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9 Terms

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Chi-square goodness-of-fit test

Used when data are frequencies. Tests whether observed frequencies match expected frequencies

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Observed frequency

actual data count

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Expected frequency

predicted count if the null hypothesis is true

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Chi-Square

non-numerical tests and categorical variables

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Multiple Regression

Predicts Y from multiple predictors (X1, X2, X3…)

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Partial regression coefficient

How much a predictor affects Y after controlling for other predictors

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R-squared

Proportion of variance in Y explained by all predictors together

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Why you can’t add R-squared values

Because predictors often overlap in the variance they explain

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Multicollinearity

Predictors are too highly correlated with each other leading to unstable regression