3. Gibbs Baby Food Company is concerned about the weight gain of infants using its brand versus its competitor's brand. A sample of 20 babies using the Gibbs products revealed a mean weight gain of 7.6 pounds in the first three months after birth. For the Gibbs brand, the sample standard deviation is 2.3 pounds. A sample of 25 babies using the competitor's brand revealed a mean increase in weight of 8.1 pounds. The sample standard deviation is 2.9 pounds. Ho: At the 0.05 significance level, test to see if babies using the Gibbs brand gained less weight. Ha: Gibbs Other Brand n xbar S

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