#### IdRatherSleep

##### New member

- Joined
- Apr 1, 2006

- Messages
- 7

For the test statistic of difference of means I got -.7026, my question is that even though this is a t distribution should I multiply this number by 2? For degrees of freedom I got 40(I used the equation, no problem there), I am supposed to use 5% level of significance so then does this mean that my p-value(-.7026) is far bigger than alpha, meaning I should choose null hypothesis?

area: .2 .1 .05 .025 .01

d.f 40: .851 1.305 1.684 2.021 2.423

My other question is what does level of significance means? I think it means the probability that I could be wrong in choosing the null hypothesis, is this correct?