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Mean useful life of all new revolutionary lightbulbs

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Reference no: EM132514949

A company wants to know the useful life of a new revolutionary lightbulb it has just developed. A mean of 64 of these bulbs revealed a mean useful life of 30,000 with a standard deviation of 1,500 hours.

A. Use this information to develop a 95% confidence interval for the mean useful life of all new revolutionary lightbulbs.

B. Use this information to develop a 98% confidence interval for the mean useful life of all new revolutionary lightbulbs.

Reference no: EM132514949

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