SOLUTION: Could someone please help me understand this: How is the mean square computed from the sum of squares? Thanks for the help!

Algebra ->  Probability-and-statistics -> SOLUTION: Could someone please help me understand this: How is the mean square computed from the sum of squares? Thanks for the help!      Log On


   

Question 1052544: Could someone please help me understand this:
How is the mean square computed from the sum of squares?
Thanks for the help!
Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
Mean Square Total is an estimate of total variance against the grand mean (mean of all samples): (SS_total)/N-1 (note: _total indicates subscript)
:
Mean Square Between groups compare the means of groups to the grand mean: (SS_between)/K-1 If the means across groups are close together this number will be small
:
Mean Square Within groups calculate the variance within each individual group: (SS_within)/N-K
:
Mean Square Between and Mean Square Within are used to calculate the F-ratio: F-ratio = MS_between/MS_within