In a single factor, within groups analysis of variance, the F-ratio is given by

= /

a) What is the 'Residual Mean Square' used to estimate?(2 marks)

b) Give twoadvantagesofemployingafactorialANOVAovertwoseparatesingle factorANOVAs.(4 marks)

c) Explain how the Residual Mean Square in a within subjects analysis of variance differs from the Within Groups Mean Square, and why such an adjustment is necessary.(4 marks)