_____ involves the investigation of the effects of one treatment variable on an interval-scaled dependent variable and determines whether statistically significant differences in means occur between two or more groups. A) Analysis of variance (ANOVA) B) Regression analysis C) Cross-tabulation D) c²

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Analysis of variance (ANOVA) involves comparing means of two or more groups to determine if there is a statistically significant difference. It is used to investigate the effects of one treatment variable on an interval-scaled dependent variable. Regression analysis is used to examine the relationship between two or more variables. Cross-tabulation is a descriptive analysis technique used to summarize and display the frequency distribution of two or more variables. "c²" is not a valid choice.

_____ Involves the Investigation of the Effects of One Treatment