Variance and Standard Deviation

Here, there is a simple explanation why we have to square the differences. Basically, it’s because “we have to be fair” when comparing data statistics. One could think that we could use module operator, instead of squaring the differences. We could, but the results may not indicate always the same idea.

The “Population Standard Deviation”:

The “Sample Standard Deviation“:

 

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s