Question: (a) A random sample of 10 electric light bulbs is selected from a normal population. The standard deviation of the lifetimes of these bulbs is

(a) A random sample of 10 electric light bulbs is selected from a normal population.

The standard deviation of the lifetimes of these bulbs is 120 hours. Find 95% confidence limits for the variance of all such bulbs manufactured by the company.

(b) Find 95% confidence limits for the standard deviation if the sample size is 100.

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