Randomly selected 11 student cars have ages with a mean of 7.2 years and a standard deviation of 3.4 years, randomly selected 27 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. (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 99% confidence interval estimate of the difference u, - H, where u, is the mean age of student cars and Hr is the mean age of faculty cars. < (Hs - Hs) <

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.