Posted by **Catherine** on Friday, December 9, 2011 at 3:44pm.

Write the null and alternative hypotheses. Justify which is the claim. A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is less than 900 hours

## Answer this Question

## Related Questions

- statitics - a light bulb manufacture gaurentees that the mean life of a certain ...
- college - a light bulb manufacture claims that the mean life of a certain type ...
- Statistics - An electrical firm which manufactures a certain type of bulb wants ...
- statistics - Suppose that the certain lifetimes of a certain light bulb are ...
- Statistics - The life of an electric light bulb is known to be normally ...
- 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 ...
- physics - You are in the lab with a 10 V battery. You have a 10 W light bulb and...
- college physics - You are in the lab with a 10 V battery. You have a 10 W light ...
- statistics - A new extended-life light bulb has an average service life of 750 ...

More Related Questions