Mathematics, 05.12.2019 02:31, nancylagunas805

The life in hours of a 75-watt light bulb is known to be normally distributed with σ = 22 hours. a random sample of 20 bulbs has a mean life of x overscript bar endscripts = 1012 hours. suppose that we wanted the total width of the two-sided confidence interval on mean life to be six hours at 95% confidence. what sample size should be used? round up the answer to the nearest integer.

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The life in hours of a 75-watt light bulb is known to be normally distributed with σ = 22 hours. a r...