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Submitted by jenna69 on June 6, 2007
Category: Psychology
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Independent Variables
- factor or characteristic set by the researcher that is being investigates as a possible cause of a change in behaviour
- CAUSE
Dependent Variables
- factor or characteristic being measures that is thought to be affected by a change in the value of the IV
- EFFECT
Population
- complete set of individuals/participants under consideration from which a sample may be drawn
Sample
- subset of the population under investigation
Random Sample
- everyone in population has equal chance of being selected
- avoids bias
Random Stratified Sample
- used when researchers are interested in identifying characteristics that vary between groups of people in the population
- divide population into strata and then sample randomly from each strata
Opportunity Sample
- Participants selected from groups and regions that are readily available
- convenience sample
- has bias
Experimental Group
- exposed to treatment (IV present)
Control Group
- exposed to control condition (IV absent)
- provides a point of reference with which to compare experimental group
Random Allocation
- procedure for assigning participants to various groups in an experiment
- all participants have an equal chance of being allocated to either control or experimental group
- used to ensure participants in experimental group are similar to those in the control group
Placebo and Experimenter Effects
Placebo Effect
- participant expectation
- change in behaviour caused by the belief that one has taken a drug
- single blind procedure participants do not know if they are in experimental or control group
Experimenter Effect
- changes in participants behaviour that are caused by the unintended influence of an experimenter
- experiment finds what it...
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