It is commonly expected that as a person ages, their muscle mass decreases. To further examine this relationship in women, a nutritionist randomly selected 60 female patients from her clinic, 15 women from each 10-year age group beginning with age 40 and ending with age 80. For each patient, her age and current muscle mass was recorded. A scatterplot, least squares regression line, and coefficient of determination are as follows.
-What is the value of the correlation coefficient between age and muscle mass for these data?
A) 0.7501
B) -0.7501
C) 0.8661
D) -0.8661

Question

It is commonly expected that as a person ages, their muscle mass decreases. To further examine this relationship in women, a nutritionist randomly selected 60 female patients from her clinic, 15 women from each 10-year age group beginning with age 40 and ending with age 80. For each patient, her age and current muscle mass was recorded. A scatterplot, least squares regression line, and coefficient of determination are as follows. 
-What is the value of the correlation coefficient between age and muscle mass for these data?
A) 0.7501 
B) -0.7501 
C) 0.8661 
D) -0.8661

Quizplus · Accepted Answer

The Answer of It is commonly expected that as a person ages, their muscle mass decreases. To further examine this relationship in women, a nutritionist randomly selected 60 female patients from her clinic, 15 women from each 10-year age group beginning with age 40 and ending with age 80. For each patient, her age and current muscle mass was recorded. A scatterplot, least squares regression line, and coefficient of determination are as follows. 
-What is the value of the correlation coefficient between age and muscle mass for these data?
A) 0.7501 
B) -0.7501 
C) 0.8661 
D) -0.8661

It Is Commonly Expected That as a Person Ages, Their