alpha level

  1. F

    Critical values problem

    Hi! I'm a complete newbie in the stats game, and I'm stuck on a problem in my book. It seems rather basic to me - so I hesitate to move on before understanding how to solve it. Would highly appreciate if someone could help me out with this by explaining the approach I should take. The problem...
  2. A

    p values, alpha, and errors

    I was speaking with a classmate about subject heading for this thread and it made me a bit confused. Here are my thoughts: the way I explain p value: probability of observing effect when, in reality, there is no effect. This translates to probability of data given the null (null=there is no...
  3. H

    How to change the alpha level in SPSS?

    I have to do a Mann-Whitney U test in SPSS and it has to be alpha = 0.01, one-tailed. I know the default is 0.05, but I don't know how to change it to 0.01 in SPSS (for Mann-Whitney U test). Is it even possible?