Question

ch 9 a researcher studying the effect of price cuts on consumers’ expectations makes up two different histories of the store price of a hypothetical brand of laundry detergent for the past year. eight students in a class view one or the other price history on a computer. some students see a steady price, whereas others see regular sales that temporarily cut the price. students are asked the price they would expect to pay. this is an example of
○ a randomized comparative experiment.
● a randomized observational study.
○ a two - factor design.
○ a matched pairs experiment.

Explanation:

1. Analyze each option:

• Randomized comparative experiment: In this, subjects are randomly assigned to different treatment groups (here, different price histories) and then compared. The researcher assigned students (subjects) randomly to view either of the two price histories (treatments) and then measured their expected price, which fits this.
• Randomized observational study: Observational studies don't assign treatments; they observe existing groups. Here, the researcher assigned the price histories (treatment), so this is incorrect.
• Two - factor design: Requires two factors (variables) being studied. Here, only one factor (price history) is manipulated, so this is incorrect.
• Matched pairs experiment: Involves pairing subjects and assigning different treatments to each pair. There's no indication of pairing here, so this is incorrect.

Answer:

A. a randomized comparative experiment