I am confused about the difference between the variance and the Squared deviations from the mean. Are they similar? or what is the difference between them?
2$\begingroup$ Welcome to CV. Please tell us what, exactly, you mean by "squared deviation". The variance is the square of the standard deviation. $\endgroup$– Peter FlomSep 3, 2018 at 12:09
$\begingroup$ @PeterFlom It's the Squared deviations from the mean $\endgroup$– Adam AminSep 3, 2018 at 12:12
3$\begingroup$ The variance is the average of those squared deviations. $\endgroup$– dbwilsonSep 3, 2018 at 12:34
1$\begingroup$ Do you mean the usual variance estimator with $n-1$ in the denominator versus the estimator with $n$ in the denominator? $\endgroup$– DaveJul 13, 2019 at 19:09
Partially answered in comments:
The variance is the average of those squared deviations.