Question 5 • Academy - Algebra, Functions, and Data Analysis
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.
Answer
A
The researcher did not use enough randomization in the process.
B
The researcher used volunteers instead of randomly selected people from the population.
C
The researcher did not assign the 50 names to the treatment group or the control group.
D
The researcher should have used numbers instead of names for confidentiality reasons.
Explanation
Randomly selecting 50 names from the hat chooses a group of participants, but it does not say which people receive mental-imagery instructions and which form a control group. To test whether imagery helps, the researcher needs to assign participants to treatment and control groups. The correct choice is “The researcher did not assign the 50 names to the treatment group or the control group.”
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