Formula
Create four columns:
"x", "(
x-M_{x})^{2"},
"y", "(y-M_{y})^{2"} - Put the raw data for group X in column
*x*, and for group Y in column*y* - Calculate the mean for both groups
- Calculate deviation scores for each group by subtracting each score
from it's group mean and squaring it and put these in the columns "
*(*" and*x*-M_{x})^{2}*"(**y*-M_{y})^{2"} - Sum the squared deviation scores for each group
- Calculate
*S*^{2}for each group - Set up formula
- Calculate
*t* - 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 was created by Richard
Hall in 1998 and is covered by a creative commons (by-nc) copyright Psychology World |