Question

over a 4-month period, among 100 people with a psychological disorder, patients who were given a high dose (877 mg/day) of a certain dietary placebo. the researchers kept track of and were aware of the dosages of supplements and placebos. complete parts a through h.
a) identify whether the above research is an observational study or an experiment.
the described research is an experiment.
b) identify the subjects studied.
a. the subjects are psychological disorders.
b. the subjects are 100 people with a psychological disorder.
c. the subjects are the population of people with a psychological disorder.
d. the subjects are certain dietary supplements.
c) identify the factor(s) in the experiment, and the number of levels for each.
how many factors are involved in this experiment?
(type a whole number.)

Explanation:

Step1: Analyze the experiment's factor

In this experiment, the treatment (dosage: high dose of dietary supplement or placebo) is the factor. We check what's being manipulated.

Step2: Determine the number of factors

There's one factor here: the type of dosage (supplement or placebo, but the factor is the dosage/treatment given, with levels like high dose supplement and placebo? Wait, no, the factor is the "dosage type" (supplement or placebo), but actually, the factor is the "treatment" (either the dietary supplement or placebo), so the factor is the type of intervention (supplement/placebo), so number of factors is 1.

Answer:

1