# Variance and Standard Deviation

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Category: Education

## Presentation Description

This is part of the course on managerial statistics that is available without passwords at http://openonlinecourses.com/statistics This video has been organized by Farrokh Alemi, Ph.D. The presentation is narrated by Yara Alemi.

## Presentation Transcript

### Variance & Standard Deviation:

Variance & Standard Deviation By Farrokh Alemi, Ph.D.

Variance

Deviation

### Deviation:

Deviation Mean Observation Distance

### Deviation:

Deviation Mean Observation More than Mean Mean Observation Less than Mean

Variance

### Standard Deviation:

Standard Deviation

### Standard Deviation:

Standard Deviation Observations in Population Mean Deviation 5 4 1 2 4 -2 5 4 1 Total 0

### Standard Deviation:

Standard Deviation Observations in Population Mean Deviation Squared Deviation 5 4 1 1 2 4 -2 4 5 4 1 1 Total 0 6

### Standard Deviation:

Standard Deviation Observations in Population Mean Deviation Squared Deviation 5 4 1 1 2 4 -2 4 5 4 1 1 Total 0 6 Number of observations 3 Standard deviation 1.7

### Standard Deviation:

Standard Deviation Small standard deviation Large standard deviation

### Standard Deviation:

Standard Deviation

### Take Home Lesson:

Standard Deviation measures the spread of data around the mean Take Home Lesson

### Do One::

Calculate the standard deviation for the following three observations: 3, 4 and 5. Do One: