Posted by **Aboli** on Thursday, February 14, 2013 at 8:48am.

a manufacturer claims that the life time of a certain brand of batteries has a varaince of 5000(hours)^2. a sample of 26 has a variance of 7200(hours)^2. assuming that it is reasonable to treat these data as a random sample from a normal population, test the manufacturer's claim at alpha=0.02 level.

plz plz help me...!!!

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