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A potential buyer of light bulbs bought 50 bulbs of each of 2 brands. Upon testing...

A potential buyer of light bulbs bought 50 bulbs of each of 2 brands. Upon testing the bulbs, he found that brand A has a mean life of 1282 hours with a S.D of 80 hours, whereas brand B had a mean life of 1208 hours with a S.D of 94 hours. Can the buyer be quite certain that the two brands do differ in quality

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