Table 5: Multiple regression predicting posttest performance on “developing and evaluating solutions” (scale 2) by prior knowledge and treatment condition.

B SE

Step  1
 Prior knowledge (pretest scores)0.530.06.44***

Step  2
 Prior knowledge (pretest scores)0.510.06.42***
 Contrast 1 (control versus COOP and COOP+META)0.660.12.26***

Step  3
 Prior knowledge (pretest scores)0.490.06.41***
 Contrast 1 (control versus COOP and COOP+META)0.670.12.27***
 Contrast 2 (COOP versus COOP+META)−0.440.20 −.10*

Note: = .19 for step 1, = .07 for step 2, = .01 for step 3. *P < .05, ***P < .001.