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?

Question

Quizplus · Accepted Answer

Eductional Objective: A t-test is used to compare the difference between the means of 2 groups.  Analysis of variance (ANOVA) compares the difference between the means of 2 or more groups.  Results from a t-test and ANOVA test will be equivalent when comparing the difference between the means of 2 groups.

A Study Is Being Done to Examine the Link Between