A teacher made 30 item multiple choice pretest was administered to both groups on the same day prior to the beginning of the treatment period. The same instrument was used as a posttest with additional short answer and essay questions. All test items were selected from the test bank which accompanied the textbook used for the unit of study and were criterion referenced to the school district's curriculum. The achievement test was validated by two experts (other teachers) who had nothing to do with the study
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