Which correlation coefficient should we use if we want to find out whether a relationship exists between two variables that are both interval or ratio variables?
a. The Pearson correlation coefficient
b. The Spearman rank-order correlation coefficient
c. The point-biserial correlation coefficient
d. The nonlinear correlation coefficient
Question 2
In general, a zero correlation means that
a. as the values of one variable increase, there is no tendency for the values of the other variable to change in any consistent, predictable fashion.
b. as the values of one variable increase, there is a tendency for the values of the other variable also to increase.
c. as the values of one variable increase, there is a tendency for the values of the other variable to decrease.
d. as the values of one variable decrease, there is a tendency for the values of the other variable also to decrease.
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