Q.

Three groups of subjects were formed with random assignment. Group-I was tested under ‘No drug’ condition, Group-II was tested under ‘Low drug dosage’ condition, and GroupIII was tested under ‘High drug dosage’ condition. Each group was required to learn two lists, a list of CVC trigrams and a list of three-lettered meaningful words. The dependent variable was the number of items recalled after ten minutes after learning each list. This experiment employs