Assignment:
The purpose of the present study conducted by Eidelman et al. (1991) was to identify the nature of lung destruction in cigarette smokers before the development of marked emphysema. Three destructive index measurements were made on the lungs of lifelong nonsmokers and smokers who died suddenly outside the hospital of nonrespiatory causes. A larger score indicates greater lung damage. For one of the indexes the scores yielded by the lunges of a sample of 9 nonsmokers and a sample of 16 smokers is shown in Table 1. Using independent-samples t-test procedure in Excel, test whether the smokers have greater lung damage as measured by this destructive index than do nonsmokers. Assume alpha of 0.05
Table Lung Destructive Index Scores
Nonsmokers: 18.1, 6.0, 10.8, 11.0, 7.7, 17.9, 8.5, 13.0, 18.9
Smokers: 16.6, 13.9, 11.3, 26.5, 17.4, 15.3, 15.8, 12.3, 18.6,
12.0, 24.1, 16.6, 21.8, 16.3, 23.4, 18.8
Source:
D. H. Eidenlman, H. Gezzo, W. D., Kim, and M. G. Cosio, (1991). The destructive index and early lung destruction in smokers. American Review of Respiratory Disease, 144, 156-159