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

Table 4

Estimated marginal means.

Group	Mean	Std. error	95% confidence interval
			Lower bound	Upper bound
Experimental	51.496^a	1.565	48.161	54.831
Control	38.949^a	1.565	35.614	42.283

^aCovariates appearing in the model are evaluated at the following values: pretotal score test = 14.11.