extra stuff

Question 1

interpretations of null fx

Answer 1

not enough b/w groups variability
too much w/in groups variability
there is truly no effect of IV on the DV

Question 2

explanations of not enough b/w groups differences

Answer 2

weak manipulation
insensitive measures
ceiling and floor fx
design confounds acting in reverse (IV increases performance, confound decreases performance)

Question 3

what’s the solution to improving between groups variability

Answer 3

manipulation check

Question 4

is unsystematic variability a confound

Answer 4

no

Question 5

3 sources of too much within groups variability

Answer 5

measurement error
individual differences
situation noise

Question 6

solutions to reducing measurement error

Answer 6

use reliable/precise measures
measure a larger sample

Question 7

solutions to reducing individual differences

Answer 7

change to w/in groups design or matched groups design
measure a larger sample

Question 8

situation noise

Answer 8

external distractions

Question 9

solution to reducing situation noise

Answer 9

conduct experiments in a carefully controlled surrounding