I have a question regarding how to specify hypothesis, i.e null and alternative.
Example is as follows: The breaking strength of a fiber is required to be at least 150 psi. A random sample of four speciments is tested .... I set up the hypothesis test as follows: Null: Mu<150 Alternative: Mu>=150 My professor said it should be another way around: Null: Mu>=150 Alternative: Mu<150 In my textbook (design and analysis of experient, Montgomery 5th), there is an example as: The manufacturer wants to know if the lot average breaking strength exceeeds 200 psi with the following hypothesis test: Null: Mu <=200 Alternative: Mu>200 Could someone point me on what is a good way to specify hypothesis test. Thanks. . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
