For all of you who are having trouble with the t-Test, Mr. O, Sinn and I created step-by-step instructions on how to perform the test during lunch. You know you love us.

Target population:

Calculate the first average (**x**1) (in Excel; =Average)

Calculate the second average (**x**2)

Subtract the means (**x**1 – **x**2)

Count the number of entries in each data set.

**n**1 = number in first data set

**n**2 = number in second data set

Plug these into the formula

Calculate **s **(use calculator) or Excel (=StDeva)

Plug-n-chug to find **t**

Calculate Degrees of Freedom:

d.f. = (**n**1 + **n**2 – 2)

Only use the line in the table that corresponds with your d.f.

Use p = or

Compare **t** values (yours and the one you found in the table). If your **t** value is greater than the one listed, then reject the null-hypothesis and accept the alternative hypothesis.

Happy calculating!