The number of times a pencil is sharpened and its length
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You calculate a correlation coefficient and test to see if it is statistically different from 0.
The answer depends on what aspect you wish to compare: If you wish to find out if the two variables are correlated one statistical technique is the chi-square test.
Correlated query has a subquery in it which accesses the column name of a table alias which is outside the subquery.
Yes. Factor pairs are always repeated across pairs since factor pairs are certain kinds of pairs.
No, but eliminating variables is one of several ways to find the value of variables in a system of equations.