Cell phone Company A adds a new charge for customers who use too much data each month; Company B does not have this charge. A marketing researcher is given access to the data usage records for both companies, starting 30 months before and ending 30 months after the charge was instituted. She found that excessive data usage declined dramatically for Company A's customers but that there was no reduction in data usage for Company B's customers. The researcher used a(n) ________ design for her study.
A) control series
B) multiple time series
C) nonequivalent control group pretest-posttest
D) patched-up quasi-experimental

Question

Quizplus · Accepted Answer

The correct answer is A because a control series design is a type of quasi-experimental design in which a single group is observed before and after an intervention, and a comparison group is observed only after the intervention. In this case, the intervention is the new charge for excessive data usage, and the comparison group is Company B's customers.

Cell Phone Company a Adds a New Charge for Customers