A population of flights can be classified according to two factors: duration (short, medium, or long) and purpose (vacation or business). We are interested in whether either of these factors has an effect on price. The table below gives mean prices for a balanced population. A medium-distance business flight costs $300 more than a short-distance business flight. However, a medium-distance vacation flights is only $200 more than a short-distance vacation flight. This difference between business and vacation flights is called:
A)interference of effects.
B)confusion of effects.
C)difference of effects.
D)interaction.

Question

A population of flights can be classified according to two factors: duration (short, medium, or long) and purpose (vacation or business). We are interested in whether either of these factors has an effect on price. The table below gives mean prices for a balanced population.  A medium-distance business flight costs $300 more than a short-distance business flight. However, a medium-distance vacation flights is only $200 more than a short-distance vacation flight. This difference between business and vacation flights is called:
A)interference of effects. 
B)confusion of effects. 
C)difference of effects. 
D)interaction.

Quizplus · Accepted Answer

The difference in the increase in price between medium-distance flights (either vacation or business) and short-distance flights varies depending on the purpose of the flight (vacation or business), indicating an interaction effect between duration and purpose on price. Therefore, the correct answer is D) interaction.

A Population of Flights Can Be Classified According to Two