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A researcher claims the mean noise levels at road construction sites in Minnesota are greater than...

A researcher claims the mean noise levels at road construction sites in Minnesota are greater than the mean noise levels at road constructions sites in Iowa. A sample of 25 construction sites in Minnesota had a mean noise level of 85 decibels with a standard deviation of 8 decibels. A sample of 20 constructions sites in Iowa had a mean noise level of 82 decibels with a standard deviation of 7 decibels. Use the five step method to test the researchers claim using α = .05. Assume the distributions of noise levels at road construction sites in both Minnesota and Iowa are approximately normal.

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