A marketing class designs two videos advertising an expensive Mercedes sports ca

Question

A marketing class designs two videos advertising an expensive Mercedes sports car. They test the videos by asking fellow students to view both (in random order) and say which makes them more likely to buy the car. Mercedes should be reluctant to agree that the video favored in this study will sell more cars because: a. The study used a matched pairs design instead of a completely randomized design b. Results from students may not generalize to the older and richer customers who might buy a Mercedes c. The study was an observational study, not an experiment d. The sample was not selected at random, so the study cannot claim a causal relationship.

Explanation / Answer

Basically any kind of bias in a group will make the group different from the other and thus Mercedes will not agree to the study as the study was done on a biased groups.

Hence, a. is not the answer - as it doesn't give a bias

b. doesn't matter. We are searching for a bias but in this option some fact is given unrelated to question at hand

c. doesn't matter as far as we dont find differences between the 2 groups/

d. Is right. If its not random, then there is bias and therefore the study cannot claim a causal relationship

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