Historically, biology has been taught through lectures, and assessment of learning was

Chapter 8, Problem 8.66

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Historically, biology has been taught through lectures, and assessment of learning was accomplished by testing vocabulary and memorized facts. A teacher-devoloped new curriculum, Biology: A Community Content (BACC), is standards based, activity oriented, and inquiry centered. Students taught using the historical and new methods were tested in the traditional sense on biology concepts that featured biological knowledge and process skills. The results of a test on biology concepts were published in The American Biology Teacher and are given in the following table.11 Sample Standard Mean Size Deviation Pretest: all BACC classes 13.38 372 5.59 Pretest: all traditional 14.06 368 5.45 Posttest: all BACC classes 18.50 365 8.03 Posttest: all traditional 16.50 298 6.96 a Give a 90% confidence interval for the mean posttest score for all BACC students. b Find a 95% confidence interval for the difference in the mean posttest scores for BACC and traditionally taught students. c Does the confidence interval in part (b) provide evidence that there is a difference in the mean posttest scores for BACC and traditionally taught students? Explain.