The Gibbs Baby Food Company wants 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 mean weight gain of 7.6 poungs in the first three 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 increase in weight of 8.1 pounds in the first three months after birth, with a standard deviation of 2.9 pounds. Can Gibbs be 95% certain that babies using their products gained less weight?