Fostering Achievement of Low-, Average-, and High-Achievers Students in Biology through Structured Cooperative Learning (STAD Method)

Table 7

Estimated marginal means.

Group	Mean	Std. error	95% confidence interval
			Lower bound	Upper bound
Experimental	58.705^a	1.068	56.520	60.889
Control	50.045^a	1.068	47.861	52.230

^aCovariates appearing in the model are evaluated at the following values: pretotal score test = 17.53.