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assigning subjects - Coggle Diagram
assigning subjects
within subject design
each participant undergoes every condition
+good control over individual confounding var.
+less error variance
+saves money and time
-carry over effects
reduce by counterbalancing
between subject design
randomly
assign subjects
only works for big groups
matching
on particular (possibly confouding) variable
but: pretesting may threat validity & more work
can´t match all variables
less subjects needed
always reduce error variance
hold variables constant across groups
randomize variables across groups
mixed design
involves two independent variables
between subject variable
what differs groups from each other
within subject variable
what groups share