A Study Is Being Done to Examine the Link Between

A study is being done to examine the link between smoking status and forced expiratory volume in one second (FEV₁) . Subjects are chosen at random and classified depending on their smoking status. Group A includes 200 nonsmokers, Group B includes 200 light smokers (1-7 cigarettes per day) , Group C includes 200 intermediate smokers (8-22 cigarettes per day) , and Group D includes 200 heavy smokers (23+ cigarettes per day) . All individuals' FEV₁ levels are quantified using appropriately calibrated office spirometers. Which of the following statistical methods is best for comparing the mean FEV₁ findings across all four groups?

A) Analysis of variance
B) Chi-square test
C) Meta-analysis
D) Multiple logistic regression
E) Pearson correlation coefficient
F) Two-sample t-test

Correct Answer:

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