Question: An environmental impact study was performed in a small state to determine the effectiveness of scrubbers on the amount of pollution coming from the cooling

An environmental impact study was performed in a small state to determine the effectiveness of scrubbers on the amount of pollution coming from the cooling towers of a chemical plant. The amounts of pollution (in ppm) detected from the cooling towers before and after the scrubbers were installed are given below for 23 cooling towers.

Suppose a larger study is planned for a state with a more extreme pollution problem.
a. How many chemical plant cooling towers need to be measured if we want a probability of .90 of detecting a mean reduction in pollution of 10 ppm due to installing the scrubbers using an Î± = .01 test?
b. What assumptions did you make in part (a) in order to compute the sample size?

Mean Standard Deviation Before scrubber After scrubber Difference before after 71 63 26 25 20

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