There is a strong straight-line relationship between the outdoor temperature and the amount of energy used to air condition a house. Higher temperatures require more energy to keep the house cool. Knowing this, a reasonable value for the correlation coefficient between temperature and home energy consumption is:
A) r = 1.
B) r = 0.8.
C) r = 0.
D) r = -0.8.
E) r = -1.

Question

Quizplus · Accepted Answer

The correlation coefficient (r) measures the strength and direction of a linear relationship between two variables. A value of r = 0.8 indicates a strong, positive linear relationship, which aligns with the scenario where higher temperatures lead to increased energy consumption for air conditioning.

There Is a Strong Straight-Line Relationship Between the Outdoor Temperature