How is the proportion of variance accounted for calculated?
a. It is the same as the point-biserial correlation coefficient.
b. It is the square root of the point-biserial correlation coefficient.
c. It is the squared point-biserial correlation coefficient.
d. It is the slope and intercept of the regression line.
Question 2
In an experiment, the proportion of variance accounted for is also called the
a. effect size.
b. error reduction coefficient.
c. confidence interval.
d. standard error of the difference between means.
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