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?