In the study referred to in Exercise 16.20, Spilich et al. (1992) also investigated performance on a cognitive task that required the participant to read a passage and then to recall it later. This task has much greater information processing demands than the pattern recognition task. The independent variable was the three smoking groups referred in Exercise 16.20. The dependent variable was the number of propositions recalled from the passage. The data follow.

34 65 5 3 2 5 2 4 6 8 75 61 2 Am 48 29 34 6 8 6 9 54 8 7 60 5 5 25 49 4 5 239 20 5 3 2 7 4 30 4 4 4 9 9