Posted by Anonymous on Sunday, November 8, 2009 at 8:45am.
Find the variance for the given data. Round your answer to one more decimal place than the original data.
{8.5, 4.5, 8.8, 6.9, 5.3}

Math  PsyDAG, Sunday, November 8, 2009 at 10:49am
First find the mean. Then find the difference of each score from the mean. (As a check, the sum of these differences should be zero.) Square each difference and find their sum. Divide that sum by n (number of scores) to get your variance.
I'll let you do the work.
I hope this helps. Thanks for asking.

Math  Anonymous, Sunday, November 8, 2009 at 11:03am
I wouldn't want you to do the work, so thank you!
Mean is 6.8
6.88.5=1.7^2=2.89
6.84.5=2.3^2=5.29
6.88.8=2^2=4
6.86.9=0.1^2=0.1
6.85.3=1.5^2=2.25
14.53/5=2.906
1.705

PsyDAG  Anonymous, Sunday, November 8, 2009 at 11:08am
Is my work correct? I think I messed up somewhere in the process.

Math  Anonymous, Sunday, November 8, 2009 at 11:13am
And I wanted to ask is it standard for the sums to always add up to 0? Thank you for that tip.

Math  PsyDAG, Sunday, November 8, 2009 at 11:14am
Doesn't .1 * .1 =.01?
However, I did not check the whole process.

Math  PsyDAG, Sunday, November 8, 2009 at 11:17am
The sum of the differences from the mean will always add to zero, assuming that you have not made a mistake.
Remember that the mean acts as a balance point for the distribution, so the scores on one side (+) must equal the scores on the other ().

Math  Anonymous, Sunday, November 8, 2009 at 11:19am
Mean is 6.8
6.88.5=1.7^2=2.89
6.84.5=2.3^2=5.29
6.88.8=2^2=4
6.86.9=0.1^2=0.01
6.85.3=1.5^2=2.25
14.44/5=2.888 So the variance is 2.9!!
1.6994
Wow! Thanks for catching that, it changed the entire process. I appreciate your help.
Answer This Question
Related Questions
 math  find the standard deviation for the given data. Round your answer to one ...
 Math  Find the standard deviation for the given data. Round your answer to one...
 Math  Find the standard deviation for the given data. Round your answer to one ...
 math  Find the standard deviation for the given data. Round your answer to one ...
 math  Find the standard deviation for the given data. Round your answer to one ...
 Please help me with this Q  Find the standard deviation for the given data. ...
 math  Find the standard deviation for the given data. Round your answer to one ...
 math  Find the standard deviation for the data. Round your answer to one more ...
 statistics  Can someone help me with this questions. Find the variance for a ...
 Math  Find the standard deviation for the given data. Round your answer to one ...
More Related Questions