Use the Fisher LSD test to compare active smokers with nonsmokers and to compare the two groups of smokers on the data in Exercise 16.21. What do these data suggest about the advisability of smoking while you are studying for an exam and the advisability of smoking just before you take an exam?

16.23 Spilich et al. (1992) ran a third experiment in which the three groups of smokers participated in a driving simulation video game. The AS group smoked immediately before the game but not during it. The data follow, where the dependent variable is an adjusted score related to the number of collisions. Run the analysis of variance and draw the appropriate conclusions.

Non- Delayed Active Smokers Smokers Smokers 15 7 3 2 0 2 2 6 0 14 0 0 5 12 6 0 17 2 16 1 0 14 11 6 9 4 4 17 4 1 15 3 0 9 5 0 3 16 6 15 5 2 13 11 3