(1 point) Randomly selected 19 student cars have ages with a mean of 7.4 years and a standard deviation of 3.4 years, while randomly selected 26 faculty cars have ages with a mean of 5 years and a standard deviation of 3.3 years. 1. Use a 5% significance level to test the claim that student cars are older than faculty cars. Assume that the of both populations are Normally distributed with the same variance. (a) The test statistic is (b) The critical value is (c) Is there sufficient evidence to support the claim that student cars are older than faculty cars? OA. No OB. Yes 2. Construct a 95% confidence interval estimate of the difference us - uf, where us is the mean age of student cars and uf is the mean age of faculty cars. Note: You can earn partial credit on this