# Long-distance runners have contended that moderate exposure to ozone increases lung capacity. To investigate this possibility,...

###### Question:

Long-distance runners have contended that moderate exposure to ozone increases lung capacity. To investigate this possibility, a researcher exposed 12 rats to ozone at the rate of 2 parts per million for a period of 30 days. The lung capacity of the rats was determined at the beginning of the study and again after the 30 days of ozone exposure. The lung capacities (in mL) are given here.

 Before Exposure 8.7 7.9 8.3 8.4 9.2 9.1 8.2 8.1 8.9 8.2 8.9 7.5 After Exposure 9.4 9.8 9.9 10.3 8.9 8.8 9.8 8.2 9.4 9.9 12.2 9.3
1. Is this independent or paired data and why
2. Which nonparametric test would be appropriate to compare the two groups
3. Test to determine if there is a difference in the distribution of lung capacity in rats before and after exposure. Use appropriate non parametric test.

Alpha= 0.5

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