# P values (stats)

1. Oct 9, 2007

### Punchlinegirl

1. The problem statement, all variables and given/known data
Suppose that we are testing H_0: $$\mu$$ =$$\mu_0$$ versus H_1: $$\mu$$ $$\neq$$$$\mu_0$$. 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-$$\Phi$$(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. Oct 10, 2007

### EnumaElish

For part (e), use $\Phi$(-z) = 1 - $\Phi$(z).