The pretest-posttest, nonequivalent control group design aids in checking the extent of group similarity, and the pretest scores may be used for statistical control or for generating gain scores.是什么意思_The pretest-posttest, nonequivalent control group design aids in checking the extent of group similarity, and the pretest scores may be used for statistical control or for generating gain scores.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句