In which of the following cases is it most useful to pool the variances?
a. s12 = 7.3, N1 = 15 and s22 = 8.1, N2 = 15
b. s12 = 7.3, N1 = 15 and s22 = 52.3, N2 = 6
c. s12 = 8.4, N1 = 13 and s22 = 12.1, N2 = 19
d. none of the above
C
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