Acid Rain Acid rain, caused by the reactionof certain air pollutants with rainwater, is
Chapter 8, Problem 33(choose chapter or problem)
Acid Rain Acid rain, caused by the reactionof certain air pollutants with rainwater, is a growingproblem in the United States. Pure rain falling throughclean air registers a pH value of 5.7 (pH is a measureof acidity: 0 is acid; 14 is alkaline). Suppose watersamples from 40 rainfalls are analyzed for pH, and x and s are equal to 3.7 and .5, respectively. Find a 99%confidence interval for the mean pH in rainfall andinterpret the interval. What assumption must be madefor the confidence interval to be valid?
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