Question: We have 2 samples from 2 populations with information x1 = 7.2, s1 = 2, n1 = 9; x2 = 9.0, s2 = 4, n2

We have 2 samples from 2 populations with information x1 = 7.2, s1 = 2, n1 = 9; x2 = 9.0,

s2 = 4, n2 = 16;

If we assume 12 = 22

Find an estimate s2p of the common variance i.e. Find pooled variance

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