Variance of the sample mean

E[(xbar - mu)^2] = sigma^2 / N.

Usage

VarXbar(sigma, N)

Arguments

sigma

per-observation standard deviation, >= 0.

N

sample size, >= 1.

Value

list(var_mean).

References

Morin, D. J. (2016). Probability: For the Enthusiastic Beginner. Createspace. Eq (3.92).

Examples

VarXbar(3, 9)$var_mean
#> [1] 1