Posted by **Anonymous** on Sunday, January 20, 2013 at 10:55pm.

Mrs. Orlof teaches two history classes, one in the morning and one in the afternoon. Yesterday she gave the same test to both classes. Anyone who failed the test must take a retest. Since a greater percentage of students who took the morning test failed the test than students who took the afternoon test, more of Orlofâ€™s morning history students than afternoon history students will have to take the retest.

The conclusion above is not necessarily valid because

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