They are:

M

M

M

L can now be computed as: L = (.5)(4) + (.5)(3) + (-1)(2) = 1.5.

The estimated value of

is therefore 1.5.

In order to compute MSE, it is necessary to compute s² for each group. The values are: 1.334, 1.334, and 0.666. Therefore,

MSE = (1.334 + 1.334 + 0.666)/3 = 1.111.

Σa² =[.5² + .5² + (-1)²] = 1.5

Since there are four subjects in each group, n = 4

The component parts of s are now computed: