Best Answer

You want some measure of how the observations are spread about the mean. If you used the deviations their sum would be zero which would provide no useful information. You could use absolute deviations instead.

The sum of squared deviations turns out to have some useful statistical properties including a relatively simple way of calculating it. For example, the Gaussian (or Normal) distribution is completely defined by its mean and variance.

User Avatar

Wiki User

โˆ™ 2009-10-26 13:20:24
This answer is:
User Avatar
Study guides


20 cards

A polynomial of degree zero is a constant term

The grouping method of factoring can still be used when only some of the terms share a common factor A True B False

The sum or difference of p and q is the of the x-term in the trinomial

A number a power of a variable or a product of the two is a monomial while a polynomial is the of monomials

See all cards
1518 Reviews

Add your answer:

Earn +20 pts
Q: When computing the sample variance the sum of squared deviations about the mean is used for what reason?
Write your answer...
Still have questions?
magnify glass
Related questions

Can the standard deviation or variance be negative?

No, a standard deviation or variance does not have a negative sign. The reason for this is that the deviations from the mean are squared in the formula. Deviations are squared to get rid of signs. In Absolute mean deviation, sum of the deviations is taken ignoring the signs, but there is no justification for doing so. (deviations are not squared here)

Something at variance with reason or manifestly false?


Reason for computing an index?

to organize similar data

Reason for appling for a computing course?

You need a job at the end of it?

Why do scientific notation needs computing?

For the same reason that numbers in ordinary notation need computing.

Is there a professional cloud computing business in Denver?

With the advent of Cloud Computing, there is no more reason for you computing for individual users can be hosted in a professional data center instead of on a desk.

Why would a favorable price variance for material might be the cause of unfavorable quantity variance?

A favorable/unfavorable price variance does not effect your quantity variance. The reason you would see a favorable price variance and an unfavorable quantity variance is because you consumed more materials than your standard allows AND the price you paid for those material was less than your standard price. If you paid more than your standard price, you would have experienced an unfavorable variance in both quantity and price.

What is the Sum of deviation from the mean is?

The sum of deviations from the mean, for any set of numbers, is always zero. For this reason it is quite useless.

When computing Standard deviation should you eliminate the extreme values?

Generally not without further reason. Extreme values are often called outliers. Eliminating unusually high values will lower the standard deviation. You may want to calculate standard deviations with and without the extreme values to identify their impact on calculations. See related link for additional discussion.

What is the reason for multiplying the sales quantity variance by the budgeted sales price even if the actual sales volume was sold at a different price?

for profit.........

Why is it important to study history of computing?

In my point of view The First reason is to study the mobile computing history is the very nature of the application may require the use of a communication network that connects several computers.

Are the units of volume cubed or squared why?

Cubed. The reason is that space has three dimensions - and that is basically what we are measuring.

People also asked

Sex positions uncircumcised?

View results

Is bond Br-Br polar or nonpolar?

View results

Does TK marry Kari in Digimon?

View results