SOLUTION: A light bulb manufacture guarantees that the mean life of bulbs is at least 750 hours. A random sample of 36 bulbs has a mean life of 745 with a standard deviation of 60 hours. At

Question 459474: A light bulb manufacture guarantees that the mean life of bulbs is at least 750 hours. A random sample of 36 bulbs has a mean life of 745 with a standard deviation of 60 hours. At alpha = 0.02, do you have enough evidence to reject his claim?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!

.
The rejection zone is below -2.05 at the .02 level.
There is not enough evidence to reject the null hypothesis.
.
Ed
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