a researcher randomly selected 217 student cars at a community college and found that they had ages with a mean of 7.89 years and a standard deviation of 4.8 years. the researcher then selected 152 faculty cars from the same community college and found that they had ages with a mean of 5.99 years and a standard deviation of 3.65 years. suppose that this sample data is used to test the claim that the ages of student cars are more variable than the age of faculty cars. what is the test statistic for the test?