Acid rain, caused by the reaction of certain air pollutants with rainwater, is a growing problem in the United States. Pure rain falling through clean air registers a pH value of 5.7 (pH is a measure of acidity. 0 is acid, 14 i5 alkaline). A sample of n = 30 rainfalls produced pH readings with x = 3.7 and s = 0.6. Do the data provide sufficient evidence to indicate that the mean pH for rainfalls is more acidic (Ha: u 5.7 O HO: u : 5 7 versus H341 5.7 versus Ha: u E z 0 O Ho: (P1 - P2) = 0 versus Ha: (P1 - P2) > 0 O Ho: (P1 - P2) = 0 versus Ha: (P1 - P2) 0 O Ho: (M1 - M2) # 0 versus Ha: (M1 - 12) = 0 O Ho: (M1 - 12) 0 O Ho: (M1 - M2) = 0 versus Ha: (M1 - 12) = 0 3. Test statistic: Z = 4. Rejection region: If the test is one-tailed, enter NONE for the unused region. Z > Z