A certain brand of battery is claimed to have an average lifetime of 750 hours. Since the price of these batteries is favourable, a customer decides to purchase it unless it can be shown that the true average lifetime of batteries is smaller than what is claimed. A random sample of 50 batteries was selected and the average lifetime was found to be 738.44 hours with standard deviation of 38.20 hours. What conclusion would be appropriate for a significance level of 5%? Find out the p-value of the test.
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If this happens, then your hypothesis must be true. ... You would like to test your belief because without a good ... You have a guess that the mean life of a battery is less .
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