Acid rain is the rain with a pH value less than 5.7. It caused by the reaction of certain air pollutants with rain water, and is observed in the polluted areas. Suppose that the specimens of rain water from n = 50 rainfalls in certain polluted area are analyzed for pH levels. For 50 rainfalls sample mean and sample standard deviation s are equal to 3.5 and 0.7 respectively. a. Estimated mean value of pH for all rainfalls in a polluted area is b. A 99% margin of error for the mean value of pH for all rainfalls is Keep one digit after decimal point in the answer b. c. A 99% confidence interval for mean value of pH for all rainfalls is ( Keep one digit after decimal point in the answer c.

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