John runs the same three-mile route every day. If he takes his dog, it adds 25 seconds to his running time. If it is cold, it adds 10 seconds to his running time. Suppose he ran one cold morning with his dog. What change in his time would represent no interaction between the two variables (dog and temperature)?
A) increase 10 seconds
B) increase 25 seconds
C) increase 35 seconds
D) decrease 15 seconds
E) none of the other alternatives are correct.

Question

Quizplus · Accepted Answer

The no interaction effect means the total change in time is simply the sum of the individual changes: 25 seconds for the dog and 10 seconds for the cold, totaling 35 seconds.

John Runs the Same Three-Mile Route Every Day