Between-Subjects t-test

Example | Calculator (will open another window)

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Formula

	M = mean n = number of scores per group
	x = individual scores M = mean n= number of scores in group

 

Steps

Create four columns: "x", "(x-M_x)^2", "y", "(y-M_y)^2"

1. Put the raw data for group X in column x, and for group Y in column y
2. Calculate the mean for both groups
3. Calculate deviation scores for each group by subtracting each score from it's group mean and squaring it and put these in the columns "(x-M_x)²" and "(y-M_y)^2"
4. Sum the squared deviation scores for each group
5. Calculate S² for each group
6. Set up formula
7. Calculate t
8. Check to see if t is statistically significant on probability table with df = N-2 and p < .05 (N = total number of scores)

Example

Practice by creating your own data and then check your work with the Virtual Statistician t-test Calculator
(Only works with n = 8)