experimental methods Flashcards
experimental research: hypothesis
a hypothesis is comprised of the IV and DV and states how they will be measured and predicts the relationship between them
experimental research: EV
is things other than the iv that can affect the dv unlike a confounding variable the ev MAY interfere swell as the iv but the confounding variable does
experimental research: confounding variable
an uncontrolled variable that has had an unwanted effect on the dv and might be confused with the effect of the iv example order effects, standardisation and experimenter effect
experimental research: methods for controlling or eliminating unwanted variables
the type of the experiment, counterbalancing, single and double blind procedures, placebos, type of sampling procedures, standardised instructions and procedures and the type of experimental design chosen
sampling procedures and allocation to groups: sampling methods
random sampling: a sampling technique ensuring that every member of the population of interest has an equal chance of being selected for the sample being used in a study. stratified: sampling technique that ensures the sample contains the same proportions of participants that are found in the population. conveience sampling: a sampling technique involving the selection of participants because they are readily available to the researcher
research methods
Repeated measures: where the same group of participants makes up both the experimental and control groups. independent groups: where participants are randomly allocated to either the experimental group or control group
qualitative data
data that describes the changes in the quality of a behaviour; often accounts of personal attitudes or experiences, or descriptions of feelings
quantitative data
data called through systematic and controlled procedures and presented in numerical form
ethical principles
debriefing, voluntary participations, deception, confidentiality, withdrawal rights, informed consent
