Here is an ANOVA summary table for a 2-way fixed-effects balanced design.  Going “old-school”, only the F-ratios have been provided.  Using =FINV() in Excel, find the critical values for each hypothesis test at both the $\displaystyle \alpha={0.05}$ and $\displaystyle \alpha={0.01}$ significance levels.

Source	$\displaystyle {S}{S}$	$\displaystyle {d}{f}$	$\displaystyle {M}{S}$	$\displaystyle {F}$	$\displaystyle {F}_{{{0.05},{d}{f}_{{1}},{d}{f}_{{2}}}}$	$\displaystyle {F}_{{{0.01},{d}{f}_{{1}},{d}{f}_{{2}}}}$
$\displaystyle {A}$	3301.9	4	825.475	1.723
$\displaystyle {B}$	4097.7	5	819.54	1.711
$\displaystyle {A}\times{B}$	15715.7	20	785.785	1.64
Error	186810	390	479
TOTAL	209925.3	419

Finally, what was the sample size for each cell in this 2-factor design?
$\displaystyle {n}=$