What effect does smoking have on performance? Spilich, June, and Renner (1992) asked nonsmokers (NS), smokers who had delayed smoking for three hours (DS), and smokers who were actively smoking (AS) to perform a pattern recognition task in which they had to locate a target on a screen. The dependent variable was latency (in seconds). The data are presented below. Plot the resulting means and run the analysis of variance. On the basis of these data is there support for the hypothesis that smoking has an effect on performance?
Non- Delayed Active Smokers Smokers Smokers 9 12 8 8 7 8 12 14 9 10 4 1 7 8 9 10 11 7 9 16 16 11 17 19 8 5 1 10 6 1 8 9 22 10 6 12 8 6 18 11 7 8 10 16 10