A correlation coefficient expresses the direction but not the magnitude of a relationship. ...

A correlation coefficient expresses the direction but not the magnitude of a relationship.
 
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In an inverse relationship as one variable gets larger the other variable gets smaller.
 
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In a straight line the slope approaches zero as the line comes near the point X, Y.
 
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The slope of a line is a measure of its rate of change.
 
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In a perfect linear relationship all the points must fall on a straight line.
 
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In a linear relationship all the points must fall on a straight line.
 
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The easiest way to determine if a relationship is linear is to calculate the regression line.
 
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r decreases as N decreases.
 
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Assuming a correlation exists, as the range of one of the variables decreases, r increases.
 
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In order to compute r, we must first convert each score to its z score and then do our calculations with the z scores.
 
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