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To test the effect of a new exercise routine on muscle growth, a researcher sets up the following experiment: 60 volunteers subjects (40 men and 20 women) of average build are selected to participate in the study. Their body mass and muscle sizes (biceps, thighs, etc. ) are measured. The researcher gives all the men a DVD with the new exercise routine, and the women a DVD with a standard routine, but only the researcher knows this. The results of the experiment are likely to be invalid mostly because



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ajinems

The results of the experiment are likely to be invalid mostly because the treatment group and control group were not the same size.

What is treatment group?

In an experiment, the treatment group are those groups that receives the test drug or the group that the researcher manipulates or changes. It is also called an independent variable.

The control in an experiment is defined as the group in an experiment that remains unaffected by other variables and are not given the testing drug.

From the given experiment, the number of volunteers selected are 60 with 40 men and 20 women.

The result of the experiment is likely going to be invalid since the number of control group and treatment group are not the same which should be.

Learn more about control groups here:

https://brainly.com/question/28601688

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