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Longer experiment goes on more chance for these to

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Unformatted text preview: experiment after it has started, these happen mostly in field work. Longer experiment goes on, more chance for these to happen. Maturation: there are changes that can happen to the respondent over the course of the experiment (people get hungry, people see somebody sneeze and they're scared of getting sick). Mortality: People drop out of the experiment. Testing effects: the actual experiment changes how people react in the experiment. Regression towards the mean: respondents tend to be extreme in there responses at the 3 beginning but then regress towards average over time (you just have to be aware of them). Ways to Control Extraneous Factors Randomization: taking out concerns for gender or something, you just randomly put people in different conditions, this is a good way to eliminate concerns. Matching: not just randomly putting them there but making sure the groups have comparable breakdowns for demographics and other stuff. Physical control: there is no other influences, they do sound control and white room. Design control: the way you actually design it that would lead or not lead to these extraneous variables. Statistical control: techniques that allow for those extraneous variables to be captured and elminated or w/e you need. • Randomization • Matching • Physical Control • Design Control • Statistical Control didnt talk about this Experimental Designs • Features − Ivs manipulated − subjects − Dv to be measured − plan to deal with confounds • Types A Classi...
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