I need help. The following answers are wrong besides the test statistic

(1 point) Randomly selected 120 student cars have ages with a mean of 7.2 years and a standard deviation of 3.6 years, while randomly selected 105 faculty cars have ages with a mean of 6 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. The test statistic is 2.531698981 The critical value is 1.980 Is there sufficient evidence to support the claim that student cars are older than faculty cars? OA. Yes OB. No 2. Construct a 99% confidence interval estimate of the difference #1 - /2, where ] is the mean age of student cars and / is the mean age of faculty cars. -0.034