<PRE><B>Question 333025</B>
you dont have enough information to determine MSE, because MSE=SSE/dof, and you dont provide data on SSE or to be able to calculated.
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Now, if you are asking about the degrees of freedom for MSE, that can be determine with what you are providing
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Let N= total sample size = {{{sum(ni) = 3*5+2*7=29}}}
let k= number of treatments =5

The degrees of freedom for computing MSE:  N-k-1=29-5-1=23

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there is one restriction for estimating the overall mean, and one restriction for estimating each treatment mean</PRE>