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Finding and Calculating the F Ratio

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Discussion Assignment #12
1. What is an F ratio and how is it calculated?
2. If SSbetween = 30, SSwithin = 40, dfbetween = 3, and dfwithin = 20, then F = ______.
3. If dfbetween = 3, and dfwithin = 60, if alpha is set at .05, then Fcrit =______.
4. If the sample size is 30 and the mean score for group one is 5.6, mean score for group two is 7.8, and mean score for group three is 4.8, what is the SS between of this study?

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Discussion Twelve
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Discussion Twelve
(1) F ratio is defined as the ratio of between-group variance (MS between) and the within-group variance (MS within)
it is calculated using the formula
F ratio = MS between/MS within
(2) Given that SS between = 30, SS within = 40, df between = 3, and df within = 20
MS (between) = SS between / df between
= 30/3
= 10
and
MS (wit...
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