A retailer is interested in studying the effect of in-store promotions on the amount of money people spend during a store visit. Which of the following will NOT be considered an extraneous variable for this study?
A)The mood of the shoppers as they enter the store.
B)The average amount of money spent by shoppers in the store.
C)The number of kids under the age of two that accompany an adult shopper.
D)The day of the week / month when the study is conducted.
E)The air temperature outside the store.

Question

Quizplus · Accepted Answer

The average amount of money spent by shoppers in the store is actually the main variable of interest in this study and not an extraneous variable. It is what the study is trying to measure and therefore cannot be considered extraneous. The other variables listed (mood, number of kids, day/month of study, and air temperature) could potentially impact the amount of money spent by shoppers and will need to be controlled for in the analysis.

A Retailer Is Interested in Studying the Effect of In-Store