(1 point) Randomly selected 19 student cars have ages with a mean of 7.7 years and a standard deviation of 3.6 years, while randomly selected 16 faculty cars have ages with a mean of 5.9 years and a standard deviation of 3.5 years. 1. Use a 0.01 significance level to test the claim that student cars are older than faculty cars. (a) The test statistic is (b) The critical value is