Andrea Foster 18. The of a relationship gives us an indication of the extent to which error in the scores of the dependent variable is reduced by knowledge of scores in the independent variable. D existence B. direction C. strength D. nature 19. If you want to find out if 2 nominal variables are significantly related, which statistical test do you use? A. T-Test B. Chi-Square C. Regression D. ANOVA E. Correlation (Pearson's "r") F. Correlation (Spearman's "r") 20. If you want to find out if 1 nominal variable with 2 categories is significantly related to one interval-level variable which statistical test do you use? B. Chi-Square C. Regression D. ANOVA