Which of the following statistical tests cannot be used to examine differences between groups?

Question

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Pearson's r is used to examine the relationship between two interval- or ratio-level variables. ANOVA is used to examine the means (interval- or ratio-level dependent variable) of three or more groups. Chi-squared can be used to examine differences in the frequency of a nominal-level variable among two or more groups.

Which of the Following Statistical Tests Cannot Be Used to Examine