Answered: 0.5 1.0 1.5 2.0 Placebo Improvement…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

Antidepressants A study compared the effectiveness of
several antidepressants by examining the experiments in
which they had passed the FDA requirements. Each of

those experiments compared the active drug with a pla-
cebo, an inert pill given to some of the subjects. In each

experiment some patients treated with the placebo had
improved, a phenomenon called the placebo effect.
Patients’ depression levels were evaluated on the

Hamilton Depression Rating Scale, where larger num-
bers indicate greater improvement. (The Hamilton scale

is a widely accepted standard that was used in each of
the independently run studies.) The scatterplot at the top
of the next column compares mean improvement levels
for the antidepressants and placebos for several
experiments.a) Is it appropriate to calculate the correlation? Explain.
b) The correlation is 0.898. Explain what we have
learned about the results of these experiments.

0.5
1.0
1.5
2.0
Placebo Improvement
(Hamilton Scale)
Drug Improvement
(Hamilton Scale)
4)

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