To investigate an alleged unfair trade practice, the Federal Trade Commission takes a random sample of 25 "5-ounce" candy bars from a large shipment. The mean of the sample weights is 4.90 oz and the sample standard deviation is 0.2 oz. Using the 5% significance level does the FTC have grounds to proceed against the manufacturer for the unfair practice of short-weight selling? State the decision rule, the test statistic, and your decision