One sample has n = 8 and SS = 21 and a second sample has n = 8 and SS = 35. What is the pooled variance for the two samples? a. 56/14. b. 28 c. 56 d. 56/16 Solution B is the right answer n1=8 , s12= 21 ,n2 = 8, s22= 35 pooled variance = (n1-1)s12+(n2-1)s22/(n1-1)+(n2-1) = ( 8-1)*21+(8-1)*35/((8-1)+(8-1)) = 392/14 = 28.