13. Teaching Biology An experiment was conducted to compare a teacher-developed curriculum, that was standards-based, activity-oriented, and inquiry-centered to the traditional presentation using lecture, vocabulary, and memorized facts. The test results when students were tested on biology concepts, published in The American Biology Teacher, are shown in the following table.

a. Find a 95% confidence interval for the difference in mean scores for the two teaching methods.

b. Does the confidence interval in part a provide evidence that there is a real difference in the average scores using the two different teaching methods?
Explain.

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Sample Standard Mean Size Deviation 365 8.03 16.5 298 6.96 Teacher-developed 18.5 Curriculum Traditional Presentation