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[DOC File]1 and 2 variance HT’s and CI’s
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The variance is the square root of the standard deviation. The standard deviation is zero only when all values are the same. The standard deviation is strongly affected by outliers.
relationship between standard deviation and variance

How To Calculate the Variance and Standard Deviation
Sometimes instead of standard deviation we talk about variance which is the same as standard deviation without the square root, but they both measure the same thing, variability. All HT’s and CI’s for standard deviations are considered very risky and should be only done with the help of a …
difference between deviation and variance

[DOC File]Standard deviation - 清華大學物理學系
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For checking whether the equal spread assumption is reasonable (i.e., whether the t-test and ANOVA inferences that assume equal spread will be valid), a rule of thumb is to look at whether the ratio of the largest sample standard deviation to the smallest sample standard deviation is less than two. Here the ratio is 7.77/5.13 = 1.51 < 2.
why variance is squared

[DOC File]Comparisons Among Several Samples (Analysis of Variance ...
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If two data sets have the same standard deviation, they must have the same coefficient of variation. 100. The units for the variance are the same as the units for …
standard deviation formula and variance

[DOC File]AP Statistics
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STANDARD DEVIATION: This is just the square root of the variance and is used more often than variance. The notation is . Example to show that and variance and standard deviation are a measure of how data vary, that is, if the data is more variable these numbers are bigger. Consider the 3,3,5,6,13 example as well as 5,5,5,6,7,8.
standard deviation definition

[DOC File]RANDOM VARIABLES: probability distributions, means, …
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The standard deviation is less than the variance because it's the square root of a number larger than one. The coefficient of variation is even smaller because the mean is larger than the standard deviation.
how is variance different than standard deviation

Is variance the same as standard deviation