21.
Manipulation of variables means

22.
A relationship in correlation co-efficient that does not form a straight line when it is graphed is described as . . . . . . . .

24.
To obtain the . . . . . . . . , we find the deviation of each score from the mean and then square it. These squared deviations are then added and averaged.

28.
If the average test score of the experimental group is higher than that of the control group, it can be concluded that . . . . . . . .

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