Statistics, 4th Edition

Published by W. W. Norton & Company
ISBN 10: 0393929728
ISBN 13: 978-0-39392-972-0

Chapter 1 - Part 1 - Design of Experiments - Exercise Set A - Page 20: 5

Answer

Vitamin C does indeed prevent colds and can be used to treat colds. This is because groups 2 and 4 had the fewest colds as Vitamin C was given as prevention. Likewise, groups 3 and 4 had the shortest colds as Vitamin C was given as therapy.

Work Step by Step

1. First, analyze the table to determine which combinations of placebo and Vitamin C produced the fewest colds. 2. Then, analyze the table to determine which combinations of placebo and Vitamin C produced the shortest colds. 3. Determine what the groups with either the fewest or shortest colds had in common. 4. Arrive at the conclusion that Vitamin C aids in both preventing colds and reducing their duration.
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