Formula
Create five columns:
"x", "("
x-M_{x})^{2"},
"y", "(y-M_{y})^{2", }"xy - 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
- Multiply each pair of scores and put the result in column "
*xy*" - Sum "
*xy*" scores - Calculate s for each group
- Set up formula
- Calculate
*r* - Check to see if r is statistically significant on probability table
with
*df*= n-2 and p < .05
Practice by creating your own data and then check your
work with the Virtual Statistician Pearson Correlation
Calculator was created by Richard
Hall in 1998 and is covered by a creative commons (by-nc) copyright Psychology World |