An example in the text hypothesized that 4% of the variability in life expectancy was accounted for by variability in smoking behavior. The values of r and r² , respectively, are equal to A) .20 and .04. B) .04 and .16. C) .04 and .20. D) More information is needed.

Question

Quizplus · Accepted Answer

The correct answer is derived from understanding the relationship between the coefficient of determination (r^2) and the correlation coefficient (r). The statement mentions that 4% of the variability in life expectancy is accounted for by variability in smoking behavior, which means r^2 = .04. To find r, we take the square root of .04, which is .20. Therefore, r = .20 and r^2 = .04.

An Example in the Text Hypothesized That 4% of the Variability