The Gibbs Baby Food Company wishes to compare the weight gain of infants using their brand versus their competitor’s. A sample of 40 babies using the Gibbs products revealed a meanweight gain of 7.6 pounds in the first three months after birth. The standard deviationof the sample was 2.3 pounds. A sample of 55 babies using the competitor’s brand revealed a mean increase in weight of 8.1 pounds, with a standard deviation of 2.9 pounds. At the .05 significance level, can we conclude that babies using the Gibbs brand gained less weight? Compute the p-value and interpret it.
Using hypothesis testing to deduce whether Gibbs brand food induces babies to gain more or less weight.