Mathematics, 02.11.2019 06:31, Selen13

Amanufacturer has tested 11 lithium-ion batteries, and finds that their lifetime is 400 charge cycles with a standard deviation of 10. an engineer is testing a cheaper design and wants to know if it has changed battery life. the average lifetime for 10 of the new batteries is 390 cycles, and the standard deviation of that sample is 8. define change in lifetime as new minus old. what is the best estimate of the change in lifetime

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Amanufacturer has tested 11 lithium-ion batteries, and finds that their lifetime is 400 charge cycle...