Question: State which correlation coefficient (Pearson, Spearman, point-biserial, or phi) should be used given the following information. (a) Both factors are interval or ratio scale. (b)

State which correlation coefficient (Pearson, Spearman, point-biserial, or phi) should be used given the following information.
(a) Both factors are interval or ratio scale.
(b) Both factors are ranked.
(c) One factor is dichotomous, and the other factor is continuous.
(d) Both factors are dichotomous.

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