Happy St. Paddy's Day! Today is gorgeous. Too bad my stomach hurts...
Now time for class...
http://en.wikipedia.org/wiki/Manipulation_checks
Errors:
Type I Found result, but shouldn't
Type II Didn't find results, but should have (doesn't get published)
Sloppy >> non-signifigant results
really easy to get n/s results. Random error.
Control is important because higher degrees of control are associated with higher levels of internal validity
Reducing Experimenter Bias
>single-blind
>double-blind
Placebo effect
Rosenthal effect
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