Changing the level of confidence?

Reference no: EM1392839

Philips is trying to estimate the mean, µ, of its Longer Life Outdoor Floodlights. A random sample of 100 found an average life of 2399 hours and a standard deviation of 311 hours.

a. Find a 95% confidence interval (nearest hour) for the mean life of the floodlights.
Interpret this interval.

b. How could the engineer increase the accuracy of the interval without changing the level of confidence?

Reference no: EM1392839

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