4. The study reported that "Booster training enhanced training gains in speed (P<.001) and

reasoning (P<.001) interventions (speed booster, 92 %; no booster, 68%; reasoning booster,

72%; no booster, 49%).

a. What do they mean by booster training?

b. The first p-value reported above suggests that there was a significant difference in scores

after training between a group that received booster training in speed compared to a

group that did not receive the booster.

The second p-value suggests:

c. What do the booster training results mean practically to the population of interest?