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Suppose a teacher decided to offer an after-school study session the day before a $100\text{ point}$ test.

The $34\text{ students}$ who came to this study session averaged scores $8\text{ points}$ higher on the test than the $72\text{ students}$ who did not come to the study session.

Based on this information, what may one conclude?

A

Enough evidence exists to say the study session was helpful.

B

If the teacher really wanted to see if the study session is helpful, she should have randomly assigned students to attend the session.

C

Since the samples sizes were quite different, no reasonable comparisons can be made in this situation.

D

Since it was not a double-blind experiment, no reasonable comparisons can be made in this situation.

E

An increase of $8\text{ points}$ is not significant enough to determine whether the study session helped.

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