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26. Range of the coefficient of correlation is
+ 2
± 1
± 0.5
± 0.25
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27. -------- is the term given to any system of the reorganization of data items within a file, where the reorganization is independent of the information content of the file.
Printing
Maintenance
Copying
Merging
28. When three or more variables are studied simultaneously for correlation analysis it is called
Simple correlation
Partial correlation
Multiple correlations
All of the above
29. In case, the coefficient of correlation is negative, the curve representing the relation will be
Vertical
Downward sloping
Upward sloping
Horizontal
30. As the value of x increases, if y also increases, the coefficient of correlation will be
Positive
Negative
Zero
None of these
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