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==Precision==  
 
==Precision==  
Precision can be described as the 'repeatability' of the result of a study, and in the case of descriptive studies is closely associated with the confidence interval. The precision is therefore a measure of the random error in a sample.
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The '''precision''' of an estimate is a measure of the 'repeatability' of this estimate if the same study was conducted again. Therefore, it is a measure of the random error inherent in a sample, which in the case of descriptive studies is closely associated with the '''confidence interval'''.  
    
==Confidence intervals==
 
==Confidence intervals==
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