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A study is conducted to determine the effect of acid rain and other industrial pollutants on...

A study is conducted to determine the effect of acid rain and other industrial pollutants on lake water. Random samples of water are drawn from 10 lakes in a heavily industrialized area, and from 8 lakes in a primitive forest area. For each specimen, the pH of the water is determined. The sample mean and standard deviation of the data from each method are:

Industrial: x=6.420, s=0.5514

Primitive: x = 6.975, s=0.1699

  1. Perform an appropriate hypothesis test to determine if the variability in pH differs between the two areas.
  1. Use the most appropriate method to construct a 95% confidence interval for the difference in mean pH between the industrial and primitive areas.
Math   Statistics-And-Probability   
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