Asked by Kim

The University of Southern Mississippi currently uses GE brad fluorescent light bulbs that have a mean life of 900 hours. Sylvania clams that its new fluorescent bulbs, that cost the same as the GE bulbs, last longer than the GE brand. A sample of 50 Sylvania bulbs produces a sample mean of 940 significance level to support Sylvania's claim?
Answered by PsyDAG
An estimate of variability (e.g., standard deviation) is needed.
Answered by Kim
The University of Southern Mississippi currently uses GE brad fluorescent light bulbs that have a mean life of 900 hours. Sylvania clams that its new fluorescent bulbs, that cost the same as the GE bulbs, last longer than the GE brand. A sample of 50 Sylvania bulbs produces a sample mean of 940 hours and a sample standard deviation of 70 hours. Is there enough evidence at the alpha = 0.05 significance level to support Sylvania's claim?
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