# TB3 + TB4 RM Key formulas

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• Created by: mint75
• Created on: 18-05-15 16:46
• RM Key Formulas
• Standard error of the mean (SEM)
• The standard deviation of the sample, divided by the square root of n
• A measure of how well the sample mean estimates to the population mean
• Variance
• Sum of the deviations from the mean squared, and divided by n-1
• Used for describing the spread or variability across scores
• Standard deviation (SD)
• The square root of the variance
• Variance
• Sum of the deviations from the mean squared, and divided by n-1
• Used for describing the spread or variability across scores
• Describes how much scores differ from the mean
• Z-Scores
• The score you're comparing - mean, divided by standard deviation
• Standard deviation (SD)
• The square root of the variance
• Describes how much scores differ from the mean
• How to view the score in comparison to the rest of the data set (e.g did she do better in test A than test B compared to the rest of class
• Confidence Intervals
• Multiply the mean by the confidence interval you are looking for e.g 95% confidence, upper limit = 64x1.05, lower limit = 64x0.95
• Indicates how confident you are that the true value will lie under x of the curve, e.g if you are 95% confident that it is between 30-50, 30-50 is the confidence interval

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