SOLUTION: The ABC battery company claims that their batteries last at least 100 hours, on average. Your experience with their batteries has been somewhat different, so you decide to conduct

Question 1162994: The ABC battery company claims that their batteries last at least 100 hours, on average. Your experience with their batteries has been somewhat different, so you decide to conduct a test to see if the company's claim is true. You believe that the mean life is actually less than the 100 hours the company claims. You decide to collect data on the average battery life (in hours) of a random sample of n = 20 batteries.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
Need to know results. You will use a t-test unless you know the population sd, in which case a z-test would be used.
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