types of experiments Flashcards
IV
factor under investigation in an experiment which is manipulated to create two or more conditions (levels) and is expected to be responsible for changes in the DV
DV
the factor in an experiment which is measured and is expected to change under the influence of the independent variable
extraneous variable
variable which either acts randomly, affecting the DV in all levels of the IV or systematically
experimental condition
one or more of the situations in an experiment which represent different levels of the IV and are compared
control condition
a level of the IV in an experiment from which the IV is absent. it is compared to one or more experimental conditions
lab
there is IV, DV & strict controls. it looks for a casual relationship and is conducted in a setting that is not in the usual environment for the participant with regards to the behaviour they are performing
experimental desgin
the way in which participants are allocated to levels of the IV
independent measures design
an experimental design in which a different group of participants is used for each level of the IV
demand characteristics
features of the experimental situation which give away the aims. they can cause participants to try to change their behaviour
random allocation
a way to reduce the effect of cofounding variables such as individual differences
repeated measures design
an experimental design in which each participant performs in every level of the IV
participant variable
individual differences between participants (age, personality & intelligence) that could affect their behaviour in a study
order effect
practice & fatigue are consequences of participating in a study more then once
practice effect
participants performance improves because they experience the experimental task more than once
fatigue effect
participants performance declines because they have experienced an experimental task more than once
