Psych (Day I slept in, so did it on the following Monday)
Reliability and validity (last class)
Does our study measure what it’s supposed to be measuring? We can apply this to a
questionnaire or the study in general.
Reliability! Is there consistency? Are procedures consistent? Do they give us consistent
results? Ex. Standardized tape measure, is the floor level, same EVERYTHING.
Multiple groups of participants. Change things for different groups of participants
Instead of one dependant and independent variables, can test LOTS of things all at once, might
be several test groups and several control groups
Random assignment: VERY POWERFUL. Manipulate independent variable, change dependant
variable? Want a control for every other variable. There are too many individual factors
influencing each individual person, so can’t control everything!
Eliminate systematic bias!
Test LARGE groups of participants (that one oddball gets “washed out”)
People who signed up early into one condition, etc. Etc. Creates systematic bias
Should flip a coin, or use random number generator to give participants a one two or three to
decide which condition they’l