Name
Educational attainment (X)
(Predictor variable=
independent variable
Assertiveness level (Y)
Dependent varialbe
Rochelle 9 23
Carny 12 29
Belinda 6 17
Amanda 8 21
Maria 11 27
Ky 15 35
Ruth 13 31
Kay 10
Sue 20
Ben 5
Table 10.1: Educational Attainment and Assertiveness Level. Text: Statistics for Social Workers (9th
edition), p.221.
We are testing there is a positive correlation between educational attainment and assertiveness level.
The regression formula is
The general equation produced by simple regression analysis is:
Y = a + b(X)
Y (Assertiveness level) = 5 + 2(Educational attainment)
Y= The predicted Y attributed from a X
X=The predictor
a: slope of the line is 2, where the amount of change in Y is directly related to the amount of change in X
b: constant is 5, where the value when the X is 0
Please select any 1 person and predict assertiveness level.
For example, I select Rochelle's assertiveness level
Y = 5+2(9) = 23. Based on the fact that Rochelle had 9 years of education, we can predict Rochelle's
assertiveness level is 23.