Calculate the degrees of freedom for the between group sum of squares. Then, use this quantity to calculate the mean square between A researcher is interested in whether there is a significant difference between the mean age of marriage across three racial groups . Based on the data below, answer these questions.

Race	N	Mean
Black	113	25.39
White	904	22.99
Other	144	23.87
All Groups	1,161	23.33

Race	Y bar for each group	Total mean	Group mean - Total mean	Square of the difference	The number of cases	Nk*Square of the difference
Black	25.39	23.33	2.06	4.2436	113	556730.6
White	22.99	23.33	-0.34	0.1156	904	121327.3
Other	23.87	23.33	0.54	0.2916	144	48750.85
					1161	Sum up= 726808.8

Calculate the degrees of freedom for the between group sum of squares. Then, use this quantity to calculate the mean square between