An Introduction to Statistical Methods and Data Analysis
An Introduction to Statistical Methods and Data Analysis
7th Edition
ISBN: 9781305269477
Author: R. Lyman Ott, Micheal T. Longnecker
Publisher: Cengage Learning
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Chapter 9.10, Problem 3E

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

l 1 = μ 1 3 μ 2 + μ 3 + μ 4 l 2 = μ 1 + μ 2 2 μ 4 l 3 = μ 1 + μ 2 + μ 3 + μ 4 l 4 = μ 1 + μ 2 3 μ 3 + μ 4

  1. a. Which of the four linear combinations are contrasts?
  2. b. Which pairs of contrasts are orthogonal?
  3. c. Suppose we have two contrasts:

l 1 = μ 1 + μ 2 + μ 3 3 μ 4   and   l 2 = 1 3 μ 1 + 1 3 μ 2 + 1 3 μ 3 μ 4

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

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