A teacher investigates the effect of extra classes on the performance of pupils in mathematics. A group of 20 pupils receives the extra classes while a control group of 20 pupils receives singing lessons. For each of the 40 pupils the teacher calculates the increase or decrease in his or her mathematics performance by comparing the marks obtained in an examination before the extra classes to the marks obtained in an examination after the extra classes. Which is the most appropriate
research hypothesis for the teacher to test?

Question

Answer

The mean mathematics score after the extra classes is larger than before the extra classes for the experimental group.

Answer

The mean mathematics score after extra classes is higher for the experimental group than for the control group.

Answer

There is a positive correlation between mathematics scores and whether students received extra classes.

Answer

The mean mathematics difference score (after minus before) of the experimental group is larger than that of the control group.

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A teacher investigates the effect of extra classes on the performance of pupils...

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