Company A claims that the variance of the life of its appliances is less than the variance of the life of company B's appliances. A random sample of the lives of 25 of company A's appliances has a variance of 2.2. A random sample of the lives of 21 of company B's appliances has a variance of 4.7. At a=0.05, can you support the company's claim? 1. What is the critical F-value? F0 = _____. 2. Calculate the test statistic.

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