Correlational analysis Flashcards
correlational analysis
a statistical technique for analysing data when there are two sets of numerical scores for each participant
co-variables
the variables investigated in a correlation
how is correlation data represented
scattergram
positive correlation
a relationship where as one variable increases, so does the other
negative correlation
a relationship between two variables where as one increases, the other decreases
zero correlation
there is no relationship between the two variables
correlation coefficient
a numerical measure of the strength and direction of the relationship between two co-variables
what are the correlation coefficients for a strong correlation
0.7, 0.8, 0.9
what are the correlation coefficients for a moderate correlation
0.4, 0.5, 0.6
what are the correlation coefficients of a weak correlation
0.1, 0.2, 0.3
correlation coefficient of no correlation
0
correlation coefficient of a perfect positive correlation
+1
correlation coefficient of a perfect negative correlation
-1
scattergram
a graph used to plot correlations where each pair of values is plotted against each other to see if there is a relationship between them
strengths of correlations
-useful for investigating the relationship between two variables
-used to make predictions about people
-other types of study can be carried out to further investigate relationship
-doesn’t involve manipulation of variables :. ethical way of investigating what cannot be manipulated experimentally
