Suppose we wanted the total width of the two-sided

Reference no: EM13634893

The life in hours of a 75-watt light bulb is known to be normally distributed with \sigma = 25 hours. A random sample of 20 bulbs has a mean life of 1014 hours. Suppose we wanted the total width of the two-sided confidence interval on mean life to be five hours at 95% confidence. What sample size should be used?

Reference no: EM13634893

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