Types of 2-Sample Designs
You must know the design before
you analyze data
IV and DV will not indicate the
design
Different t-tests used for each
design
nIndependent
Samples Ð no reason to pair the
data
nCorrelated
Samples Ð matches the data
nNatural pairs
nMatched pairs (split-litter for animals, twins, siblings)
nRepeated measure
nIf t-test is
significant Ð then difference in participant is due to the treatment