Question: The Old Gloucester Baby Food Co. wishes to compare the weight gain of infants using their OG brand versus a competitor's. A sample of 40 babies using OG product revealed a mean weight gain of 7.6 pounds in the first 3 months after birth. The standard deviation of the sample was 2.3 pounds. A sample of 55 babies using the competitor's brand revealed a mean weight increase of 8.1 pounds, with a standard deviation of 2.9 pounds. Assuming that both populations are normally distributed at the 0.05 significance level can we conclude that babies using the OG brand gained less weight?

Repeat a) to d) as in 03.