An economist conducted a study of the possible association between weekly income and weekly grocery expenditures. The particular interest was whether higher income would cause shoppers to spend more on groceries. A random sample of shoppers at a local supermarket was obtained. A questionnaire was administered asking about the weekly income of each shopper's family and their grocery bill for that week. The data below are for 10 selected survey participants: The scatterplot with a linear trend line is given below: If the expenditure for subject 7 is decreased and for subject 8 is increased, the effect on the correlation:
A)will be to decrease it.
B)will be to increase it.
C)will be no effect.
D)cannot be determined without knowing the new values for expenditure.

Question

An economist conducted a study of the possible association between weekly income and weekly grocery expenditures. The particular interest was whether higher income would cause shoppers to spend more on groceries. A random sample of shoppers at a local supermarket was obtained. A questionnaire was administered asking about the weekly income of each shopper's family and their grocery bill for that week. The data below are for 10 selected survey participants:  The scatterplot with a linear trend line is given below:  If the expenditure for subject 7 is decreased and for subject 8 is increased, the effect on the correlation:
A)will be to decrease it. 
B)will be to increase it. 
C)will be no effect. 
D)cannot be determined without knowing the new values for expenditure.

Quizplus · Accepted Answer

The Answer of An economist conducted a study of the possible association between weekly income and weekly grocery expenditures. The particular interest was whether higher income would cause shoppers to spend more on groceries. A random sample of shoppers at a local supermarket was obtained. A questionnaire was administered asking about the weekly income of each shopper's family and their grocery bill for that week. The data below are for 10 selected survey participants:  The scatterplot with a linear trend line is given below:  If the expenditure for subject 7 is decreased and for subject 8 is increased, the effect on the correlation:
A)will be to decrease it. 
B)will be to increase it. 
C)will be no effect. 
D)cannot be determined without knowing the new values for expenditure.

An Economist Conducted a Study of the Possible Association Between