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21
Manipulation of variables means
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Answer: Option C
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22
A relationship in correlation co-efficient that does not form a straight line when it is graphed is described as . . . . . . . .
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Answer: Option C
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23
The method of assembling correspondences, without experimental control over them, is known as
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Answer: Option A
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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.
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Answer: Option B
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25
Statistics can be classified as . . . . . . . .
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Answer: Option D
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26
Many a time the researcher provides false information to his subject about the purpose of research. It is called
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Answer: Option D
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27
In psychological studies variables are specified and measured with the help of
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Answer: Option D
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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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Answer: Option A
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29
The problem of effect of the observer is minimized by . . . . . . . .
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Answer: Option B
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30
Who among the following was the first man to describe 'Null Hypothesis'?
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Answer: Option B
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