A test run to compare two statistics textbooks, one with a traditional approach and one with a new approach. A state university agrees to use the traditional text in all of its 30 classes, each with approximately 50 students. A private liberal art college agrees to use the new approach text in its 4 statistics classes, each with 20 students. A SRS of 30 statistics students at each school will take a standardized final exam, and the mean scores of the two groups will be compared. Is this a good experimental design?

A test run to compare two statistics textbooks, one with a traditional approach and one with a new approach. A state university agrees to use the traditional text in all of its 30 classes, each with approximately 50 students. A private liberal art college agrees to use the new approach text in its 4 statistics classes, each with 20 students. A SRS of 30 statistics students at each school will take a standardized final exam, and the mean scores of the two groups will be compared. Is this a good experimental design?

A test run to compare two statistics textbooks, one with a traditional approach and one with a new approach. A state university agrees to use the traditional text in all of its 30 classes, each with approximately 50 students. A private liberal art college agrees to use the new approach text in its 4 statistics classes, each with 20 students. A SRS of 30 statistics students at each school will take a standardized final exam, and the mean scores of the two groups will be compared. Is this a good experimental design?



A) Yes, because it uses randomization and blocking.

B) No, because proportions of students passing would be more appropriate.

C) No, because so many more students take statistics at the university.

D) No, because the exam should have been given to all the students.

E) No, because there is a confounding variable: different kinds of schools



Answer: no, because there is a confounding variable: different kinds of schools


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