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 Orloff’s morning history students than afternoon history students will have to take the retest. The conclusion above is not necessarily valid because:

More student may have taken the test in the afternoon than in the morning.

Explanation:

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 Orloff’s morning history students than afternoon history students will have to take the retest. The conclusion above is not necessarily valid because more student may have taken the test in the afternoon than in the morning.

OPTION D==> More students may have taken the test in the afternoon than in the morning.

Explanation:

This question is a critical thinking question and it needs proper analysis in order to be able to solve the question.

Now let us go back to the question again. The Important things to note are; Mrs. Orlof teaches two history classes, one in the morning and one in the afternoon. Mrs. Orlof conducted a test to examines her students, the percentage of people that failed in the morning were higher than that of the one she conducted in the afternoon.

The argument is now that more of Mrs Orloff’s morning history students than afternoon history students will have to take the retest which might not be valid because of the of option 'D' which is also a plausible reasoning.

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you so !