This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: mileage than the old engine at ï¡ = 5% level? (Final 2003, Q2) A battery manufacturer claims that his company produces batteries with a mean life of 130 hours. An investigator working for an independent consumer protection agency wishes to test the credibility of the manufacturerâ€™s claim. She randomly selects 100 batteries produced by the process and decides that she will believe the manufacturerâ€™s claim only if the sample mean is not less than 129 hours. It is known that the standard deviation of the manufacturing process is 5 hours. (a) What is null hypothesis, alternative hypothesis? (b) What is the rejection region? (c) What is the level of significance of the test (Î±)? (d) If the investigator wishes to control the Type I error of the test to be 1%, what will be her rejection region? (e) If the sample mean of the 100 batteries that the investigator selected is 128 hours, what decision should she make at 1% level of significance?...
View
Full Document
 Spring '09
 AnthonyChan
 Statistics, Statistical hypothesis testing, 1%, 5%, 5 hours, Gas Mileage

Click to edit the document details