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A company produces and tests a new mineral supplement designed to prevent the common
cold. The company tests three dosages of the mineral supplement on 300 participants, male
and female, between the ages of 25 and 50 over a 6-month period. Each group has 100
randomly assigned participants. The table shows the dosages of the mineral supplement given

to each participant in each group and the numbers of participants that report having the
common cold during the 6-month period.
The company claims that the mineral supplement can effectively prevent the common cold. A
scientist disputes the claim, saying an error exists in the setup of the groups for the
investigation.
Which change to the investigation would remove the source of this error?

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Lanuel

A change which would remove the source of this error is to: Test a fourth group, in which participants do not receive the mineral supplements.

What is a scientific method?

A scientific method can be defined as the various techniques that are adopted to observe, investigate, examine and study a particular thing while giving explanations on the basis of the evidence, theory, proof, hypothesis, or factual information they derived from the research work.

In this scenario, a claim was made by the company its mineral supplements can effectively prevent common cold. However, this claim was disputed by a scientist because there exist an error in the group setup.

How to remove an error in science

For this investigation, an effective and efficient way to remove this source of error would be by testing a fourth group, in which the mineral supplements is not administered to any of the participants.

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