Descriptive Statistics

Enter Your Data

x <- c(2, 5, 34, 62, 45, 71)

Computing the Mean

mean(x)

## [1] 36.5

Computing the Variance

var(x)

## [1] 820.3

Computing the Standard DEviation of the Sample

sqrt(var(x))

## [1] 28.64088

Computing the Sum of the Squares of the Data

sum(x^2)

## [1] 12095

“Short-Cut” Formula for Sample Variance

n <- length(x)
(sum(x^2) - n * mean(x)^2) / (n-1)

## [1] 820.3