9.58 Acidity in Rainfall Refer to Exercise 8.34 and the collection of water samples to estimate the mean acidity (in pH) of rainfalls in Eastern Canada. As noted, the pH for pure rain falling through clean air is approximately 5.7. The sample of n = 40 rainfalls produced pH readings with 3.7 and s=0.5. Do the data provide sufficient evidence to indicate that the mean pH for rainfalls is more acidic (H <5.7 pH) than pure rainwater? Test using a =0.05. Note that this inference is appropriate only for the area in which the rainwater specimens were collected.