Essay
A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1400 hours. A homeowner selects 25
bulbs and finds the mean lifetime to be 1390 hours with a standard deviation of 80 hours. Test the
manufacturerʹs claim. Use = 0.05.
Correct Answer:
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critical value 
standardized t...View Answer
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Correct Answer:
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standardized t...View Answer
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