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Question #4 – Nonparametric Testing This is part C Of course there is a difference in...

Question #4 – Nonparametric Testing

This is part C

Of course there is a difference in the mercury concentrations of these five tributaries flowing into Lake Ontario from New York State. Just look at the median mercury concentrations of 18-mile Creek and the Genesee River.

Clearly and once again, the distribution of mercury concentrations are not normal, so use the Mann-Whitney U test approach to test the claim at 95% confidence that the median mercury concentrations in these two tributaries are different.

  1. State the Null and Alternative Hypotheses (1)
  2. If appropriate, prepare the PDF and state the Decision Rule. (2)
  3. Determine the Utest value (10)
  4. State the Decision and Interpretation. (2)

Here are the data once again:

18-Mile Creek

Genesee River

Raw Data

Rank Values

Raw Data

Rank Values

4

3

30

4

7

4

5

2

3

1

5

2

8

1

Median

Count

Sum of Ranks

math   Statistics-And-Probability   
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