The urinary fluoride concentration was measured both for a sample of livestock grazing in an area...

The urinary fluoride concentration was measured both for a sample of livestock grazing in an area previously exposed to fluoride pollution, and for a sample grazing in an unpolluted region:

polluted	unpolluted
21.3	14.2
18.7	18.3
23.0	17.2
17.1	18.4
16.8	20
20.9
19.7

Do the data strongly indicate that the distribution for fluoride concentration for livestock grazing in the polluted region is hoisted to the right of that for livestock grazing in the unpolluted region? Use alpha = .10. (Population is not normally distributed, use Mann-Whitney U-test).

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Mann Whitney U test Critical Table at alpha=0.10

orchestra answered 1 year ago

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