The mean mass of the puppies at five months is

The mean mass of the puppies at five months is 4.35 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):

At the 0.01 level, has the supplement increased the mean mass of the puppies? Determine or estimate the p-value.

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