# Thread: Statistics question P-values

1. ## Statistics question P-values

Does anyone know how to calcluate P-value? I have several questions that I have to calculate the p-value of the given test statistic

for example t=2.05; n=20
I have no idea how to get the p-value. My book does not explain this very well at all.

2. Originally Posted by rhonest
Does anyone know how to calcluate P-value? I have several questions that I have to calculate the p-value of the given test statistic

for example t=2.05; n=20
I have no idea how to get the p-value. My book does not explain this very well at all.

I assume you want to find:

$\displaystyle p=Cu(T<t)$

where $\displaystyle Cu(.)$ denotes the cumulative distribution of the statistic (RV) in question, and from what you write this is the t-statistic (distribution) with $\displaystyle 19$ (that is $\displaystyle n-1$) degrees of freedom.

You evaluate this by looking it up in a table of the distribution, or use a software package or tool that will evaluate it.

see: t Distribution

CB