A topic of ongoing public health interest is the effect of second hand smoke. In the first major stu

Question:

A topic of ongoing public health interest is the effect of second hand smoke. In the first major study the population was divided into 5 groups: nonsmokers [NS], passive smokers = those exposed to second hand smoke though not smoking themselves [PS], light smokers = half pack per day [LS], moderate smokers = one pack per day [MS], and heavy smokers = 2 packs per day [HS]. The authors measured the lung capacity of individuals with the following results:

Group	Average	Standard deviation	Sample size
NS	3.78	0.79	200
PS	3.30	0.77	200
LS	3.23	0.78	200
MS	2.73	0.81	200
HS	2.59	0.82	200

An analysis of variance produced the following partial ANOVA table:

Source SS df MS

Between 182.584 ?? ??

Within 630.780 ?? ??

TOTAL 813.364 ??

which yields a p-level of <.001 and thus the five means are not statistically the same. Use the Tukey procedure [at 5% level] to determine which means are statistically different from which other of the means. What can you conclude about PS?

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