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An electrical firm manufacturers light bulbs that have a length of life approximately normal with a...

An electrical firm manufacturers light bulbs that have a length of life approximately normal with a mean 5000 and a standard deviation of 120 hours. To test the hypothesis that µ 5000 against the alternative that µ < 5000 a random sample of 50 bulbs was tested. Find the probability of committing a type II error if µ is in fact shifted to 4950 and α = 0.05.

The probability of committing a type II error?

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