Question 6.5

6.5 Effects of TV advertising. Which of the following is an important weakness of the experiment described in Exercise 6.4?

  1. (a) This was not a matched pairs design.

  2. (b) Because undergraduate students were used as subjects and knew what was going on, the results may not generalize to everyday television viewers.

  3. (c) This was not a double-blind experiment.

  4. (d) This experiment did not use a placebo.