Award: 10.00 points Gibbs Baby Food Company wishes to compare the weight gain of infants using its brand versus its competitor's. A sample of 40 babies using the Gibbs products revealed a mean weight gain of 7.6 pounds in the first 3 months after birth. For the Gibbs brand, the population standard deviation of the sample is 2.3 pounds. A sample of 55 babies using the competitor's brand revealed a mean increase in weight of 8.1 pounds. The population standard deviation is 2.9 pounds. At the .05 significance level, can we conclude that babies using the Gibbs brand gained less weight? Required: a. State the decision rule for 0.05 significance level : He: HGibbs 2 Hcompetitor, H1: PGibbs (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.) Reject Ho if z <