Which of the following, if true, would most seriously weaken the psychologists’ conclusion?
(A) In both experiments, the victims of the filmed violence included both males and females.
(B) In the second experiment, 28 percent of the children appeared upset during the viewing the violent film scenes.
(C) The first group included 19 male students and 20 female students; the second group included 20 male students and 21 female students.
(D) In the first group, 58 percent of the children appeared bored during the showing of the film, and 12 percent fell asleep
(E) The percentage of children known to have discipline problems prior to the experiment was greater in the first group than in the second group.
4. Mainline Airways was bought by its employees six years ago. Three years ago, Mainline hired QualiCo Advertising Agency to handle its promotions and advertising division. Today Mainline’s profits are over 20 percent higher than they were five years ago and 10 percent higher than they were three years ago. Employee ownership and a good advertising agency have combined to make Mainline more profitable.
Which of the following best describes the weak point in the argument above?
(A) It fails to establish a causal connection between the change in ownership at Mainline Airways and the hiring of QualiCo, on the one hand, and the rise in Mainline’s profits, on the other.
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