ï»¿ Standard Error of Mean | Standard Error Formula | Quality America

Tools

Intervals & Tests

Confidence Intervals

Hypothesis Testing

Hypothesis Test Of Sample Mean Example

Hypothesis Test Of Two Sample Variances Example

Hypothesis Test Of A Standard Deviation Compared To A Standard Value Example

Resampling (Bootstrapping)

Tolerance intervals

Distributions

Properties of Distributions

Level of Significance

Normal Distributions

Area Under the Standard Normal Curve

Central limit theorem

Johnson Distributions

Non-Normal Distributions in the Real World

Weibull Distribution

Folded-Normal Distribution

Rayleigh Distribution for True Position

Critical Values of the t Distribution

Chi-Square Distribution

Standard error of mean

Used as an indication of the reliability of x-bar as an estimate of the mean of the population. Smaller numbers mean the estimate of the population average has less variability. To calculate, use the standard error formula below.

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where N is the total number of observations, and σx is the Population Sigma .

Learn more about the Statistical Inference tools for understanding statistics in Six Sigma Demystified (2011, McGraw-Hill) by Paul Keller, in his online Intro. to Statistics short course (only $89) or his online Black Belt certification training course ($875).