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 . . . . . . . .
23. The method of assembling correspondences, without experimental control over them, is known 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.
25. Statistics can be classified as . . . . . . . .
26. Many a time the researcher provides false information to his subject about the purpose of research. It is called
27. In psychological studies variables are specified and measured with the help of
28. If the average test score of the experimental group is higher than that of the control group, it can be concluded that . . . . . . . .
29. The problem of effect of the observer is minimized by . . . . . . . .
30. Who among the following was the first man to describe 'Null Hypothesis'?
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