Variance and Standard Deviation

of 8
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Information Report
Category:

Documents

Published:

Views: 17 | Pages: 8

Extension: PDF | Download: 0

Share
Description
Variance and Standard Deviation. The most important measures of “spread” or dispersion. Sample Variance. The variance is the average squared deviation away from the mean. For a sample of size n, divide by n – 1. For a population, divide by n. Sample mean x. The standard deviation.
Transcript
Variance and Standard DeviationThe most important measures of “spread” or dispersionSample VarianceThe variance is the average squared deviation away from the mean. For a sample of size n, divide by n – 1. For a population, divide by n.Sample mean xThe standard deviationThe standard deviation is simply the square root of the variance. The variance must always be calculated before the standard deviation.Population mean μσ and σ2 are pronounced “sigma” and “sigma squared”, respectively. The coefficient of variation (CV)The coefficient of variation standardizes the standard deviation by dividing by the mean.The Empirical Rule* This is actually a normal, continuous distribution, also known as a “bell curve”.mode = median = meanmode < median < meanmode > median > meanThe amount of skewness is measured using Pearson’s coefficient of skewness (sk):
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks
SAVE OUR EARTH

We need your sign to support Project to invent "SMART AND CONTROLLABLE REFLECTIVE BALLOONS" to cover the Sun and Save Our Earth.

More details...

Sign Now!

We are very appreciated for your Prompt Action!

x