For the following data, Group 1 Group 2 Group 3 34 6 54 7 23 8 48 6 87 7 44 9 3 2 10 95 9 X¯ 1 = 4.75 X¯ 2 = 4.62 X¯ 3 = 7.75 s

2 1 = 6.214 s 2

2 = 3.982 s 2

3 = 2.214, assume that the three groups have a common population variance, σ2 p . Estimate σ2 p .