Question

Worksheet Chapter 4.2 b Placebo Effect

Name:
Answer what is asked.
1.
C.
Period:
Date:
In an interesting experiment, researchers examined the effect of ultrasound on birth weight. Pregnant women
participating in the study were randomly assigned to one of two groups. The first group of women received an
ultrasound; the second group did not. When the subjects' babies were born, their birth weights were
recorded. The women who received the ultrasounds had heavier babies.
Did the experimental design take the placebo effect into account? Why is this important?
a.
b.
Was the experiment double-blind? Why is this important?
Based on your answers to Questions 1 and 2, describe an improved design for this experiment.

Answer 1

No, the experiment was not double blinded. The reason being because of how the people that are weighing the babies may not know whether they had received an ultrasound or not.

Explanation: