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Independent sample t test-Lung Damage

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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 1. Lung Destructive Index Scores
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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
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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

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The solution provides step by step method for the calculation of test statistic for an independent sample t test. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

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Independent-samples t-test procedure
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 non-smokers and smokers who died suddenly outside the hospital of non-respiratory causes. A larger score indicates greater lung damage. For one of the indexes the scores yielded by the lunges of a sample of 9 non-smokers 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 ...

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