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A manufacturer indicates the duration, in hours, of a 75-watt bulb is at least 1000 hours, with a standard deviation of 25 hours. A random
A manufacturer indicates the duration, in hours, of a 75-watt bulb is at least 1000 hours, with a standard deviation of 25 hours.
A random sample of 25 bulbs is taken, which turns out to have an average duration of = 980 hours. Use an alpha of 0.01. to calculate ho and ha
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