data collection threats
October 5th, 2022
Name two weaknesses of the following design (i.e, threats to either internal or external validity). Describe how the weaknesses could be overcome.
A. O1 X O2 Two group Pretest- Posttest
O1 — O2
Note: O = Pretest Observations
O2 = Posttest Observations
(R) = Random Selection & Assignment to Groups