The correlation between two nominal variables is measured using the _____ coefficient, and the correlation between two ordinal variables is measured using the _____ coefficient.
a. Pearson product-moment correlation; Spearman rank-order correlation
b. Spearman rank-order correlation; Pearson product-moment correlation
c. phi; Spearman rank-order correlation
d. point-biserial correlation; Spearman rank-order correlation
Question 2
If both variables are measured on a nominal scale, what type of correlation coefficient is appropriate?
a. Spearman's rank-order correlation coefficient
b. Phi coefficient
c. Point-biserial correlation coefficient
d. None, because correlations cannot be computed on nominal data
A simulated-color map of the surface of Venus as measured by synthetic aperture radar on the Magella
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