Find the critical value.

Determine the critical value for a right-tailed test of a population mean at the a = 0.005 level of significance with 28 degrees of freedom.

The degrees of freedom are given by

And since we are conducting a right tailed test we need to find in the right tail of the t distribution with 28 degrees of freedom a value who accumulates and we got:

Step-by-step explanation:

For this case we are assuming a right tailed test for a parameter, let's say

The system of hypothesis for this case are:

Null hypothesis:

Alternative hypothesis:

Where is the value to check

The degrees of freedom are given by

And since we are conducting a right tailed test we need to find in the right tail of the t distribution with 28 degrees of freedom a value who accumulates and we got:

i think c. but don't trust it.

step-by-step explanation:

goog may have it for you