Need explanation and answers

Statistics

Variable N N* Mean SE Mean StDev Minimum Q1 Median Q3 Maximum

EPT 463 10 10.205 0.163 3.514 0.000 8.000 11.000 13.000 20.000

The EPT value is a count of the number of mayflies, stoneflies, and caddisflies.When this value is greater than 9 the water quality assessment is Excellent.

a.Use the data to determine whether water quality of the streams in the Tug Hill Region is excellent.

b.Create a histogram and use the graph to determine if the distribution of EPT suggests that the test that was run is part a. is appropriate.Make sure to explain the reasoning for your conclusion.

c.Determine a 95% confidence interval estimate for the mean EPT value.Does this interval support your conclusion from part b?Explain.