Posted by Kim on Sunday, April 29, 2012 at 10:58pm.
An estimate of variability (e.g., standard deviation) is needed.
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?
Related Questions
probability and statistics - An electrical firm manufactures light bulbs that ...
math - You are thinking of making your mansion more energy efficient by ...
Probability Statistics - a manufacturing plant uses 3000 light bulbs whose ...
Statistics - A box contains 12 lights bulbs, of which 4 are defective. All bulbs...
Math - A consumer buys n light bulbs, each of which has a lifetime that has a ...
Math - A consumer buys n light bulbs, each of which has a lifetime that has a ...
Math - Daphne replaced light bulbs in her mothers store.She had 3/4 of a box of ...
math - A manufacturer of light bulbs knows that 3% of the production of their ...
math - A manufacturer of light bulbs knows that 3% of the production of their ...
Chemistry - Describe the spectrum of the light from a fluorescent lamp and from ...
For Further Reading
