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.
Example of variance documentation
The proportion of obese and extremely obese adults in the United States has increased over the past
Leonardo da Vinci, Study of Human Proportion: The Vitruvian Man.
Proportion of Women and Men in the U.S. Labor Force
The Inverted Income Pyramid: The Proportion of Income Received by Each Fifth of the U.S. Population
Sources of phenotypic variance