Posted by **Kim** on Sunday, April 29, 2012 at 10:58pm.

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?

- Statistics 2 (incomplete) -
**PsyDAG**, Monday, April 30, 2012 at 11:50am
An estimate of variability (e.g., standard deviation) is needed.

- Probability and Statistics 2 -
**Kim**, Monday, April 30, 2012 at 2:51pm
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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