Which Is the Best Interpretation for the Following Results of a Multiple-Baseline

Multiple Choice

Which is the best interpretation for the following results of a multiple-baseline design evaluating the effects of an intervention that aims to increase the number of hours spent studying each week by three boys in the same cabin in a residential treatment center?

A) The intervention clearly was effective.
B) The results clearly appear to be attributed to history.
C) The results could be attributed to history or to generalization of effects.
D) The results appear to be attributed to regression to the mean.
E) The results appear to be attributed to an ongoing trend that was improving with the passage of time.