Table 13.1.1b.  Means on pre-test according to post-test score

Post-test score			Experimental group			Control group
  (Midpoint)		n	  Post-test mean		n	    Post-test mean

   125			 0		  .			 1		 78.77
   120			 0		  .			 3		 94.59
   115			 0		  .			 4		 94.06
   110			 1		82.66			14		 81.53		
   105			 0		  .			16		 87.46
   100			 2		70.36			25		 77.62
    95			 3		67.19			51		 77.19
    90			14		64.20			41		 74.07
    85			21		67.90			52		 72.56
    80			29		51.64			75		 69.16
    75			48		53.40			52		 68.62
    70			50		55.05			57		 61.52
    65			57		56.23			37		 63.38
    60			57		49.52			27		 61.43
    55			52		48.99			21		 62.09
    50			54		42.81			15		 58.41
    45			42		44.94			 4		 38.98
    40			26		37.19			 5		 42.29
    35			22		33.77			 0		  ---
    30			15		37.41			 0		  ---
    25			 2		30.29			 0		  ---
    20			 4		16.75			 0		  ---
    15			 1		30.34			 0		  ---