The mean mass of the puppies at five months is 4.38 kg. The masses follow the normal distribution. In an effort to increase their mass, a supplement is added to their daily meals. The subsequent masses of a sample of five-month-old puppies were (in kilograms): 4.22 4.55 4.50 4.47 4.29 4.56 4.52 4.39 4.32 4.55 a. At the 0.01 level, has the supplement increased the mean mass of the puppies? (Round the final answer to 3 decimal places. Negative answers should be indicated by a minus sign.) Value of the test statistic Reject Ho if t> (Click to select) | Ho. There is (Click to select) evidence to conclude that the additive increased the mean weight of puppies. b. Determine or estimate the p-value. (Round the final answer to 4 decimal places.)