Teaching Biology An experiment was conductedto compare a teacher-developed

Chapter 8, Problem 47

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Teaching Biology An experiment was conductedto compare a teacher-developed curriculum,Biology: A Community Context (BACC) that wasstandards-based, activity-oriented, and inquirycenteredto the traditional presentation using lecture,vocabulary, and memorized facts. The perhaps not-sostartlingresults when students were tested on biologyconcepts, published in The American Biology Teacher,are shown in the following table.11Sample StandardMean Size DeviationPretest: All BACC Classes 13.38 372 5.59Pretest: All Traditional 14.06 368 5.45Posttest: All BACC Classes 18.5 365 8.03Posttest: All Traditional 16.5 298 6.96a. Find a 95% confidence interval for the mean scorefor the posttest for all BACC classes.b. Find a 95% confidence interval for the mean scorefor the posttest for all traditional classes.c. Find a 95% confidence interval for the difference inmean scores for the posttest BACC classes and theposttest traditional classes.d. Does the confidence interval in c provide evidencethat there is a real difference in the posttest BACCand traditional class scores? Explain.