Evidence manufacturer-s claim is true at significance level

Reference no: EM13144914

A light bulb manufacturer claimed that its light bulbs have a mean life in 800 hours. Assume the life of the light bulbs follows the normal distribution. A sample of 50 light bulbs reveled that the sample mean life is 805 hours with 64 hours of the sample standard deviation. Is there enough evidence to conclude that the manufacturer's claim is true at the 5% significance level?

Reference no: EM13144914

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