Suppose Team A is a new team and the graph below shows their performance on each of their first two nights playing basketball together. Team B is a veteran team who played exceptionally well in the first game, but not in the second game. The following graph depicts the outcomes for each team. Which of the following possible threats to internal validity are likely to be depicted in this graph?
A. a testing effect for Teams A and B
B. a testing effect for Team B, but not Team A
C. regression toward the mean and a testing effect for Team B
D. a testing effect for Team A; regression toward the mean for Team B
Ans: D
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