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Variance Assignment

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February 18th, 2020

the manufacturer of a certain brand of light bulb claim that the variance of the lives of this bulb is 4200 square hours.a consumer agency took a random sample of 25 such bulbs and tested them.

The variance of the lives of this bulb was found to be 5200 square hours. assume that the lives of all such bulb (approximately) normal distribution.a) make the 99% confidence intervals for the variance and standard deviation of the lives of all such bulbs.b) test at the 5% significant level whether the variance of such bulbs is different from 4200 square hours.

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