In other words, (given that the real difference between the mean lifetimes of batteries of company A and batteries of company B is 4.3 - 4.0 = 0.3 years), the probability that a sample of 49 batteries produced by company A will have a mean life of at least 0.5 years longer than the mean life of a sample of 36 batteries produced by company B, is only 3.3%.
STA301_LEC33
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