Refer to Exercise 8.74. Suppose that you wish to estimate the difference between the
Chapter 8, Problem 8.75(choose chapter or problem)
Refer to Exercise 8.74. Suppose that you wish to estimate the difference between the mean acidity for rainfalls at two different locations, one in a relatively unpolluted area along the ocean and the other in an area subject to heavy air pollution. If you wish your estimate to be correct to the nearest .1 pH with probability near .90, approximately how many rainfalls (pH values) must you include in each sample? (Assume that the variance of the pH measurements is approximately .25 at both locations and that the samples are to be of equal size.)
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