Starnes/Tabor, The Practice of Statistics for the AP® Course, 7e, Unit 8, English

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5 Terms

1

chi-square test statistic

Measure of how far the observed counts are from the expected counts relative to the expected counts.

2

chi-square distribution

A distribution that is defined by a density curve that takes only nonnegative values and is skewed to the right. A particular chi-square distribution is specified by giving its degrees of freedom.

3

chi-square test for goodness of fit

A significance test of the null hypothesis that a categorical variable has a specified distribution in the population of interest.

4

chi-square test for independence

A significance test of the null hypothesis that there is no association between two categorical variables in the population of interest.

5

chi-square test for homogeneity

A significance test of the null hypothesis that there is no difference in the distributions of a categorical variable in the populations of interest or for the treatments in an experiment.