A nutritionist collects data from 25 popular breakfast cereals. For each cereal, the number of calories per serving is plotted on the x-axis against the number of milligrams of sodium on the y-axis. The value of r for the resulting scatterplot is 0.83. How would the value of the correlation coefficient, r, change if sodium was plotted on the x-axis and calories plotted on the y-axis?
Answer
A
The value of r would increase.
B
The value of r would not change.
C
The value of r would change to –0.83.
D
The value of r could increase or decrease, depending of the strength of the new relationship.