On Wed, 24 Sep 2003 11:50:52 GMT, "jjl" <[EMAIL PROTECTED]> wrote:
>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 Think of it this way: if you have very weak evidence, you'll accept the null. Which should be your default decision in the absence of strong data? Duncan Murdoch . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
