In an experiment with t = 4 populations means, consider the four linear combinations of those means.

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In an experiment with t = 4 populations means, consider the four linear combinations of those means.

l1 = μ1 – μ2 + μ3 + μ4

l2 = μ1 + μ2 – μ4

l3 = μ1 + μ2 + μ3 + μ4

l4 = μ1 + μ2 –μ3 + μ4

a. Which of the four linear combinations are contrasts?

b. Which pairs of contrasts are orthogonal?

c. Suppose we have two contrasts:

Is testing H0: l1 = 0 equivalent to testing H0: l2 = 0? Justify your answer.

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