Samples Were Drawn from Three Populations $n _ { 1 } = 6 , n _ { 2 } = 7$

Samples were drawn from three populations. The sample sizes were $n _ { 1 } = 6 , n _ { 2 } = 7$ , and $n _ { 3 } = 9$ . The sample means were $\bar { x } _ { 1 } = 1.20 , \bar { x } _ { 2 } = 1.82$ , and $\bar { x } _ { 3 } = 1.51$ . The sample standard deviations were $s _ { 1 } = 0.32 , s _ { 2 } = 0.44$ , and $s _ { 3 } = 0.48$ . The grand mean is $\bar { x } = 1.524091$ . How many degrees of freedom are there for SSE.

A) 3
B) 18
C) 2
D) 19