Standard Deviation: A 5 Step Process Calculate the mean. Find mean of square differences (variance) Take square root of the deviance. Source: The Math Dude

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A z-score is how much a value deviates from the mean.Calculate Z Scores Step 4 Version

Statistics Laminate Reference Chart: Parameters, Variables, Intervals, Proportions (Quickstudy: Academic ): PThis guide is a perfect overview for the topics covered in introductory statistics courses.