STA630 Research Methods GDB no 1 fall spring fall 14 November 2011

[Vuhelper]

Statement :
(Both, the Moderating and Extraneous variables have an influence on the relationship
between the dependent and independent variable. Discuss the basis on which we can
differentiate moderating and extraneous variables?)
Solution:
Moderating
variable
Extraneous
Variables
1- strong contingent effect
on the independent
variable-dependent
variable relationship.
1-conceivably affect on the
independent variable –
dependent variable
relationship
2-presence of a third
variable modifies the
original relationship
2-To identify the true
relationship effect of the
extraneous variables may
have to be controlled
3-a moderator is a
qualitative or quantitative
in nature
3-Confounding factors is
another name
used for extraneous
variables
4-Effect the direction and
strength of relationship
between predictor and
criterian variable
4-Extraneous Variables
are undesirable variables
5-Moderator effects zero
order correlation between
two variables
5-They influence the
outcome of an experiment
6-they don’t add error to
experiment.
6- they add error to an
experiment.