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We need to describe the placebo effect in this context. How did the design of this experiment account for the placebo effect.

A placebo is something that is identical to the treatment received by the treatment group, except it contains no active ingredients.

The placebo effect is an effect produced by a placebo, which can't be due to the placebo itself, and is thus caused by the patients' belief in the treatment.

The design of the experiment accounts for the placebo effect by assigning a placebo to one of the treatment groups.

We need to explain the purpose of the random assignment.

To create two groups of subjects that are about the same at the beginning of the experiment.

This reduces bias in the conducting of the experiment.

We need to explain whether is a double-blind design a good idea in this setting.

Here,

Double-blind is when neither the patient or the experimenter know what treatment is given.

The subjects should not know which treatment they are receiving therefore that the researchers can measure how the placebo effect there is. But the researchers should also be blinded so that they can't influence how they measure the results.

We need to explain what 鈥渘ot statistically significant鈥� means in this context.

The difference in improvement between two groups was not large enough to rule out potential chance variation resulting from random assignment of the variables.

Definition of statistically significant.