Example | Calculator

M = mean
n = number of scores per group

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



Create four columns: "x", "(x-Mx)2", "y", "(y-My)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-Mx)2" and "(y-My)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)


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

Psychology World was created by Richard Hall in 1998 and is covered by a creative commons (by-nc) copyright