Before You Begin

Compute the Mean for X
Compute the Mean for the Population
Compute the Standard Deviation for the Population
or
Compute the Standard Deviation for the Sample
Determine n

ê

Do you have the Population Standard Deviation?

Yes                                                                              No

ê

ê

Compute the Standard Error of the Mean:

Estimate the Standard Error of the Mean:

ê

ê

Compute t:

Compute t:

î

í

Compute the Degrees of Freedom

df = n-1

ê

Find the Critical Value of t in Table T