Experimental design
LO: To describe and evaluate the different types of experimental design.
Do Now: Read the definitions and identify the correct variable (confounding or extraneo
__________ variables are those other than the IV that may have an effect on the DV if not
controlled. And if not controlled they tend to vary unsystematically with the IV.
Example: age of the participants, lighting of the room, room temperature etc.
__________ variables are those variables other than IV that may have affected the DV but
researchers can’t be certain of their affect. These variables tend to vary systematically with
Example: Personality of a person may affect his behaviour during a study. So the researche
be certain if the change in that behaviour is due to the IV he introduced or because of his
personality.
SPEC CHECK:
Scientific processes - Experimental designs: repeated measures, independent groups, matched p
, Experimental design
An experiment has an IV and a DV.
In order to find out whether the IV did affect the DV, we always need a comparison
condition – a condition where there is a different level of the IV.
When designing an experiment, a decision must be made; whether the participants
part in one or both conditions.
The way the two levels are delivered is called experimental design.
There are three types of experimental design.
, Independent groups design
Different participants in each condition of the experiment.
This should be done by random allocation.
Independent measures involves using two separate groups of
participants; one in each condition.
LO: To describe and evaluate the different types of experimental design.
Do Now: Read the definitions and identify the correct variable (confounding or extraneo
__________ variables are those other than the IV that may have an effect on the DV if not
controlled. And if not controlled they tend to vary unsystematically with the IV.
Example: age of the participants, lighting of the room, room temperature etc.
__________ variables are those variables other than IV that may have affected the DV but
researchers can’t be certain of their affect. These variables tend to vary systematically with
Example: Personality of a person may affect his behaviour during a study. So the researche
be certain if the change in that behaviour is due to the IV he introduced or because of his
personality.
SPEC CHECK:
Scientific processes - Experimental designs: repeated measures, independent groups, matched p
, Experimental design
An experiment has an IV and a DV.
In order to find out whether the IV did affect the DV, we always need a comparison
condition – a condition where there is a different level of the IV.
When designing an experiment, a decision must be made; whether the participants
part in one or both conditions.
The way the two levels are delivered is called experimental design.
There are three types of experimental design.
, Independent groups design
Different participants in each condition of the experiment.
This should be done by random allocation.
Independent measures involves using two separate groups of
participants; one in each condition.
