PSY 250 Study Guide - Nuisance Variable, Confounding, Internal Validity
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Also requires more participants: describe how setting influence internal and external validity, validity is when an experiment is actually testing what it is meant to test. Internal validity, relates to how well the researchers controlled for extraneous variables whereas external validity relates to how generalizable a study is. If we are looking at the overall height jumped, instead of a comparison to one"s previous jumping ability, or without consideration of their natural height, the experiment would have poor internal validity. I would like to study if drinking green tea every day has an impact on the occurrence of headaches. In a within group design, i would track how many headaches the participants had over a month. Thus, individual differences are no longer a problem of concern. Also this design requires less participants: however, in a between subjects design, i would expose only one group to the treatment.
