Solve the problem:
Hybrid Vehicle Gas Mileage. An automotive manufacturer believes that the variance of the gas mileage for its hybrid vehicles is 7.5. You work for an energy conservation agency and want to test this claim. You find that a random sample of the miles per gallon of 25 of the manufacturer's hybrid vehicles has a variance of 8.0. Let OX = 0:05.
Q1. Identify H0 and Ha. (Note: Remember you are not testing the mean, so 2, not should be used.)
Q2. Find the critical values.
Q3. Find 2, the standardized test statistic.
Q4. Decide whether to reject or fail to reject the null hypothesis.
Q5. Interpret the decision in the context of the original claim.