A randomized experiment investigates whether an herbal treatment is better than a placebo in treating subjects suffering
Question:
a. The study will use eight subjects, numbered 1 to 8. Using random numbers, pick the four subjects who will take the herbal treatment. Identify the four who will take the placebo.
b. After taking the assigned treatment for three months, subjects results on the depression scale are as follows: Subject Response Subject Response Subject Response Subject Response
Based on the treatment assignment in part a, find the sample mean response for those who took the herbal supplement and for those who took the placebo.
c. Using the means in part b, explain how (i) sample means can be different even when there is no effect in a population of interest, and (ii) a difference between two sample means may not be statistically significant even though those sample means are not equal.
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Related Book For
Statistics The Art And Science Of Learning From Data
ISBN: 9780321755940
3rd Edition
Authors: Alan Agresti, Christine A. Franklin
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