15. According to a nationwide survey conducted by Statistics Canada, the mean birth weight in Canada is 3.4kg. A doctor would like to gain evidence for the hypothesis that urban mothers deliver babies whose birth weights are greater than 3.4kg. She conducted a statistical test based on 125 Canadian urban newborns with a sample standard deviation 0.78kg. Suppose that the pValue of this test. is 0.0158. 'Nhat is the mean weight (in kg) for those 125 Canadian urban newborns? (A) 3.25 (B) 3.4 (C) 3.15 (D) 3.55 (E) 3.67