content area left Part 1 Describe the explained variation about a regression line in words and in symbols. . . . Question content area right Part 1 Choose the correct answer below. A. The explained variation is the sum of the squares of the differences between the y-values of each ordered pair and the mean of the y-values of the ordered pairs. B. The explained variation is the sum of the squares of the differences between the observed y-values and the predicted y-values. C. The explained variation is the sum of the squares of the differences between the predicted y-values and the mean of the y-values of the ordered pairs