A correlation between two interval/ratio variables is measured using the _____ coefficient, and a correlation between two nominal variables is measured using the _____ coefficient
a. Pearson product-moment correlation; phi coefficient
b. Spearman rank-order correlation; Pearson product-moment correlation
c. phi; Spearman rank-order correlation
d. Pearson product-moment correlation; point-biserial correlation
a
Psychology
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a. random selection. b. high internal validity. c. manipulation of an independent variable. d. control of extraneous variables.
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