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Can you explain clearly ? A. monufacturing company cloims that litetimes of its botteries are not less thun 22 bours. A test of 16 batteries

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A. monufacturing company cloims that litetimes of its botteries are not less thun 22 bours. A test of 16 batteries results in average. lifctime of 20.65 hours and standerd deviation of 7.2 houss. Assaming narmality of the fiftimes of these betterias construct and test the hypetheser. Let =0.01

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