Which correlation should be used to measure the relationship between gender and grade point average for a group of college students?
a. Pearson correlation c. Point-biserial correlation
b. Spearman correlation d. Phi-coefficient
Question 2The effect size for the data from an independent-measures t test can be measured by r2, which is the percentage of variance accounted for. Which of the following also produces the value for r2?
a. Squaring the Spearman correlation for the same data
b. Squaring the point-biserial correlation for the same data
c. Squaring the Pearson correlation for the same data
d. None of the other options will produce r2.
Question 3Under what circumstances is the phi-coefficient used?
a. When one variable consists of ranks and the other is regular, numerical scores
b. When both variables consists of ranks
c. When both X and Y are dichotomous variables
d. When one variable is dichotomous and the other is regular, numerical scores
Question 4What correlation is obtained when the Pearson correlation is computed for data that have been converted to ranks?
a. The Spearman correlation c. The phi coefficient
b. The point-biserial correlation d. It is still called a Pearson correlation.
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