Mathematics, 29.03.2021 18:30 pyromadestill

Construct a 95% con dence interval for the di erence between the mean lifetimes oftwo kinds of light bulbs, given that a random sample of 100 light bulbs of the rst kindlasted on the average 400 hours of continuous use and 100 light bulbs of the second kindlasted on the average 420 hours of continuous use. The population standard deviations areknown to be1

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Construct a 95% con dence interval for the di erence between the mean lifetimes oftwo kinds of light...

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