A student states that exercise will affect the number of times a person can squeeze a clothespin in a certain amount
of time. An experiment is carried out to test this hypothesis. One group of ten students sits quietly before
squeezing a clothespin as many times as possible during a one-minute interval. A second group of ten students
does 20 jumping jacks before squeezing a clothespin as many times as possible during a one-minute interval.
State one way the experiment could be improved in order to increase the validity of the results

One way the experiment could be improved in order to increase the validity of the results is increasing the number of students.

Explanation:

Options for this question are:

To increase the validity of the results, one of the alternatives is to increase the size of the sample to be studied, in this case, to increase the number of students participating in the experiment.

In order to validate an investigation, several factors must be taken into account, including the selection of the sample. Since any research runs the risk of being invalidated by the presence of bias, certain aspects must be corrected to ensure the validity of the results obtained.

Selection bias -a systematic error- is one of the internal factors that can affect the validity of the results. Increasing the student sample may decrease this bias and increase the possibility of the research being valid.

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