Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 1 - Introduction to Statistics - 1-4 Collecting Sample Data - Beyond the Basics - Page 34: 36


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By prospective the author means that the people in the experiment were followed for a long time. By randomized he means that it was random for everyone which treatment out of the posisible three he got. By double-blind he means that the people making the experiment and the subjects did not know who got which treatment. By placebo-controlled he means that they used placebo to check if the other two treatments had any effects on the subjects' conditions.
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