Question

which of the following describes what is randomized in an experimental study? * 1 point the group of subjects who receive a treatment must be randomly determined to avoid selection bias. the factors that determine the treatment and control groups must be randomly assigned to avoid biasing the researchers. the steps of the experiment must be randomly ordered to avoid selection bias. how treatments are administered to the treatment group must be randomly determined to avoid biasing the researchers.

Explanation:

In experimental studies, randomization of the group of subjects (treatment group) is done to avoid selection bias. Randomly assigning subjects to treatment/control groups ensures that confounding variables are evenly distributed, making results valid. Other options are incorrect: randomizing factors to avoid biasing researchers is not the purpose of randomization (it's about subject assignment), randomizing experiment steps doesn't relate to selection bias, and randomizing how treatments are administered isn't the key aspect of experimental randomization (it's subject assignment to groups).

Answer:

The group of subjects who receive a treatment must be randomly determined to avoid selection bias.