A restaurant is interested in examining the effect of increasing the price of hamburgers on its sales. During the first six months of the year, it measures the number of hamburgers sold each day. It then increases the price and records the number of hamburgers sold each day for the last six months of the year. This quasi-experimental design would be an example of a(n) :

A) nonequivalent control group pretest-posttest design.
B) interrupted time series design.
C) control series design.
D) nonequivalent control group design.

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Crystal Charles · Accepted Answer

Final Answer : B, Explanation :  This experimental design is an interrupted time series design, as the intervention (increasing the price of hamburgers) occurs at a specific point in time, and the outcome (number of hamburgers sold) is measured before and after the intervention. There is no control group in this design, as the restaurant is measuring the effect within its own sales data. Options A, C, and D all involve a control group, which is not present in this design.

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