The results of a study of Mexican American girls aged 9 to 12 years are typical.

Question

The results of a study of Mexican American girls aged 9 to 12 years are typical. Researchers measured body mass index (BMI), a measure of weight relative to height, for both girls and their mothers. People with high BMI are overweight or obese. the researchers also measured hours of television watched, minutes of physical activity, and intake of several kinds of food. the researchers found that the correlation between the BMI of young girls and their hours of physical activity in a day was r = -0.18. Why might we expect this correlation to be negative? the girls doing less physical activity will have a lower BMI. the girls doing more physical activity will have a lower BMI. the girls doing more physical activity will have higher BMI. Fill in the blank: percent of the variation in BMI among the girls can be explained by the straight-line relationship with hours of physical activity. (Give your answer to one decimal place.)

Explanation / Answer

here % of variation in Y explained by x is called coefficient of determiation R2 whcih is equal to (r2)*100% =3.24%

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