A researcher is interested in whether using mental imagery can help people remember specific details when given information. To conduct the experiment, the researcher asks 100 volunteers to participate. The researcher places everyone’s name in a hat and randomly selects 50 names, making sure to sure to mix the names between each selection. Which component is missing from the researcher’s process?

The researcher did not use enough randomization in the process.

The researcher used volunteers instead of randomly selected people from the population.

The researcher did not assign the 50 names to the treatment group or the control group.

The researcher should have used numbers instead of names for confidentiality reasons.