This preview shows page 1. Sign up to view the full content.
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
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
• Physical Control
• Design Control
• Statistical Control didnt talk about this Experimental Designs
− Ivs manipulated
− Dv to be measured
− plan to deal with confounds • Types A Classi...
View Full Document
This document was uploaded on 03/25/2014.
- Spring '14