Answer:
The sample size is n = 22. So then we can find the degrees of freedom given by:

And since is a bilateral test we can find the p value with this:

And the excel code to find it is : "=2*T.DIST(-1.576,21,TRUE)"
Explanation:
For this case we have the following system of hypothesis:
Null hypothesis:

Alternative hypothesis:

So we are conducting a bilateral test. We know that after find the statistic for this case we got

The sample size is n = 22. So then we can find the degrees of freedom given by:

And since is a bilateral test we can find the p value with this:

And the excel code to find it is : "=2*T.DIST(-1.576,21,TRUE)"