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Homework Help: P values (stats)

  1. Oct 9, 2007 #1
    1. The problem statement, all variables and given/known data
    Suppose that we are testing H_0: [tex]\mu[/tex] =[tex]\mu_0[/tex] versus H_1: [tex]\mu[/tex] [tex]\neq[/tex][tex]\mu_0[/tex]. Calculate the P-value for the following observed values of the test statistic.
    a: z_0 =2.45
    e: z_0=-0.25


    2. Relevant equations
    none


    3. The attempt at a solution
    I got part a by using the equation, P=2[1-[tex]\Phi[/tex](z_0)]. I got the value for the probability from the table in the book since it's a normal distribution and the p-value was equal to .014286.
    Then for part e, I tried using the same equation as before, but I got a p-value of 1.19. My equation was P=2[1-.401294]
    Can someone help with what I'm doing wrong? Thanks in advance
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 10, 2007 #2

    EnumaElish

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    Science Advisor
    Homework Helper

    For part (e), use [itex]\Phi[/itex](-z) = 1 - [itex]\Phi[/itex](z).
     
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