Refer to the EPA study of average bacteria counts in water specimens at two river locations, Exercise

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Refer to the EPA study of average bacteria counts in water specimens at two river locations, Exercise 7.20

(p. 362). How many water specimens need to be sampled at each location in order for a 95% confidence interval for the true mean difference in bacteria counts to yield an estimate that lies within 1.5 bacteria of the true difference? Assume equal sample sizes will be collected at each location.

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