Why is there a need to find a variance and take the square root to get a standard deviation?
8860
Why square the difference instead of taking the absolute value in standard deviation?
93521
Why is the expected value (mean) of a variable written using square brackets?
146190
Question about the relationship between the variance of residuals and variances of the data points
89511
Calculating MEAN and STANDARD DEVIATION confussed
53958
General misconception about $\sqrt x$
109310
Understanding “the mean minimizes the mean squared error”
109839
What is the Necessity of $...$ Around Numbers?
19
Why is the square root of a sum not equal to the square root of each its addends?
85425
Is there any simple method to calculate $\sqrt x$ without using logarithm
135727
Error Measures, why is the sum halved? why not use the absolute value?
146400
When finding outliers from the Interquartile range why I have to multiply by 1.5?
26758
Square root of inverse gamma distribution?
35139
Why is sample standard deviation a biased estimator of $\sigma$?
85588
How variance is defined?
98064
Why is the sampling distribution of variance a chi-squared distribution?
89910
Is it possible to find the combined standard deviation?
45891
When (and why) should you take the log of a distribution (of numbers)?