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How long do new batteries last? A random sample of n1 = 42 small flashlights were installed with brand I batteriesand left on until the batteries failed. The sample mean lifetime was x1 = 9.8 hours. Another random sample of n2 =38 small flashlights of the same model were installed with brand II batteries and left on until the batteries failed.The sample mean lifetime was x2 = 8.1 hours. Historical data suggests s1 = 2.2 hours and s2 = 3.5 hours.How long do new batteries last? A random sample of n1 = 42 small flashlights were installed with brand I batteriesand left on until the batteries failed. The sample mean lifetime was x1 = 9.8 hours. Another random sample of n2 =38 small flashlights of the same model were installed with brand II batteries and left on until the batteries failed.The sample mean lifetime was x2 = 8.1 hours. Historical data suggests s1 = 2.2 hours and s2 = 3.5 hours.

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