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A random sample of 91 light bulbs had a mean life of 1725 days with a standard deviation of 24 days?

a. Calculate an interval estimate for the mean life, , of light bulbs of this type. In other words, construct a 90% confidence interval for the mean life, , of light bulbs of this type

b.Write the confidence interval in terms of a probability statement. Interpret the confidence interval in words

 

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