Answer to Question #332580 in Statistics and Probability for lovely

Question

A lightbulb manufacturer regularly advertises that his bulbs last for at least 900 hours with

a standard deviation of 75 hours. A random sample is chosen before each campaign to

make sure that the claim is correct. If one such sample of 20 bulbs shows a mean of 925

hours, can the advertising claim be considered true at 0.05 level of significance?

Step Solution

1. State the null and alternative hypothesis

concerning the population mean, μ and the

type of test to be used

2. Specify the level of significance α

3. State the decision rule.

4. Collect the data and perform calculations.

5. Make a statistical decision.

6. State the conclusion.