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AS PSYCHOLOGY NOTES
Experimental Designs and Hypotheses
Looking at the letters `RIM' in Experimental
R Repeated Measures Design
o Participants are involved in more than one condition
I Independent Design
o Participants are in one condition only. In this design, control groups may be
used to ensure the IV caused the effect.
M Matched Participants
o Participants are matched one or more characteristics
This is a testable statement and they are always paired:
1. Experimental Hypothesis
2. Null Hypothesis
Experimental Hypothesis Example
"That rain will make you grow."
This includes an IV (putting people in the rain) and a DV (measuring whether they grow) and also
the word `that'
Null Hypothesis Example
"That hitting Paddy will have no significant effect on Jacob and any change will occur purely by
This hypothesis states that any change in behaviour is due purely to chance and includes the
word `that', an IV (hitting Paddy) and a DV (measuring the effect on Jacob).
Directional and Non-directional Hypotheses
Directional: Prediction about the directional change
Non-directional: No prediction about the directional change
1 AS Level Psychology