A researcher would like to conduct a hypothesis test to determine if the mean age of faculty cars is less than the mean

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A researcher would like to conduct a hypothesis test todetermine if the mean age of faculty cars is less than the mean ageof student cars. A random sample of 25 student cars had asample mean age of 7 years with a sample variance of 20, and arandom sample of 32 faculty cars had a sample mean age of 5.8 yearswith a sample variances of 16. What is the critical value ofthe rejection region if the difference is taken as student -faculty and the test is conducted using a 5% significancelevel?