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[DOC File]Standard Error - Stanford University
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Macrocephaly: excessive size of the head, most often more than two standard deviations above the mean. Microcephaly: excessively small head size, most often more than two standard deviations below the mean . Standard deviation: a measure of the width of the amount of variation among the values of a variable in a population [END OF MODULE]
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[DOC File]Deviation and Standard Deviation
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Mean, Variance, and Standard Deviation. Let be n observations of a random variable X. We wish to measure the average of in some sense. One of the most commonly used statistics is the mean, , defined by the formula. Next, we wish to obtain some measure of the variability of the data.
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Standard deviation - Wikipedia
In a certain sense, the standard deviation is a "natural" measure of statistical dispersion if the center of the data is measured about the mean. This is because the standard deviation from the mean is smaller than from any other point.
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[DOC File]Numerical Measures of Central Tendency
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c. the square of the standard deviation. d. the mean divided by the standard deviation. e. None of the above answers is correct. 52. The variance can never be. a. zero. b. larger than the standard deviation. c. negative. d. all of the above are correct. e. None of the above answers is correct. 53. If two groups of numbers have the same mean, then
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[DOCX File]Describing and Interpreting Data
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Standard Deviation of a Population (dealing with a population) This is the standard deviation of raw scores from a measure on which we have obtained a set of scores. Standard Deviation Estimate (with a sample, estimating the population) In fact, mostly, we don't know the information of the population, we use one sample to estimate the parameter ...
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[DOC File]4 - University of Washington
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A common measure of spread is based on the squared deviations. Sample variance: The “average” squared deviation (using n-1 as the divisor) Definitional Formula: s2 = Previous example: s2 = Shortcut formula: s2 = Another common measure of spread: Sample standard deviation = positive square root of sample variance.
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[DOC File]Mean, Variance, and Standard Deviation
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The standard deviation is a measure of . stand-alone risk. Risk: Systematic and Unsystematic. Stand-alone risk is measured by dispersion of returns about the mean and is relevant only for assets held in isolation. It consists of: Diversifiable (company-specific, unique, or unsystematic)
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[DOC File]Home | University of Pittsburgh
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The standard deviation is the average variation of the data values from the mean of the values and is the most commonly used measure of variation. Note that the values for the standard deviation are different for a sample and a population.
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[DOC File]Standard deviation - 物理學系
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The commonly used measure of variability is called the "standard deviation". Supposedly, the standard deviation tells us the size of a typical deviation from the mean for a particular set of data. Based on your answers to #4, guess at the value of the standard deviation. _____ Then take a guess as to how you think this value is might be calculated.
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Standard deviation is a measure of what