Posted by **jamie** on Monday, April 18, 2011 at 1:09am.

a light bulb manufacture gaurentees that the mean life of a certain type of bulb is at least 875 hours. A random sample of 40 light bulbs has a mean life of 863 hours with a standard deviation of 50. a=0.04

## Answer this Question

## Related Questions

- Business Statistics - The quality control manager at a light bulb factory needs ...
- Statistics - An electrical firm which manufactures a certain type of bulb wants ...
- college - a light bulb manufacture claims that the mean life of a certain type ...
- math - 1) A light bulb producing company states that its lights will last an ...
- statistics - the life of light bulbs is distributed normally. The variance of ...
- statistics - Write the null and alternative hypotheses. Justify which is the ...
- Statistics - The life of an electric light bulb is known to be normally ...
- 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 ...
- Statistics - An industrial engineer has found that the standard household light ...

More Related Questions