Experimental Research Quiz: Independent, Dependent Variables, and Control Groups

🧪 Quick Study Guide

• 🌱 Independent Variable: The variable you manipulate or change in an experiment. It's the presumed cause.
• 🍂 Dependent Variable: The variable you measure to see if it's affected by the independent variable. It's the presumed effect.
• 🧑‍🔬 Control Group: A group in an experiment that does not receive the treatment (independent variable). Used as a baseline for comparison.
• ➕ Experimental Group: The group that receives the treatment (independent variable).
• 📊 Constants: Conditions that are kept the same for all groups in the experiment.
• 🎯 Aim: To determine if changes in the independent variable cause changes in the dependent variable.
• 📝 Hypothesis: A testable prediction about the relationship between the independent and dependent variables.

🤔 Practice Quiz

1. What is the purpose of a control group in an experiment?
   1. A) To receive the experimental treatment.
   2. B) To serve as a baseline for comparison.
   3. C) To manipulate the independent variable.
   4. D) To measure the dependent variable.
2. In an experiment, what do you call the variable that is manipulated by the researcher?
   1. A) Dependent variable
   2. B) Control variable
   3. C) Independent variable
   4. D) Confounding variable
3. Which variable is measured to see if it is affected by the experimental manipulation?
   1. A) Independent variable
   2. B) Dependent variable
   3. C) Control variable
   4. D) Extraneous variable
4. A researcher is studying the effect of a new drug on reaction time. What is the independent variable?
   1. A) Reaction time
   2. B) The new drug
   3. C) The control group
   4. D) The researcher
5. Using the same scenario as above (drug on reaction time), what is the dependent variable?
   1. A) The new drug
   2. B) Reaction time
   3. C) The control group
   4. D) The dosage of the drug
6. What should researchers do to minimize the impact of extraneous variables?
   1. A) Increase the sample size
   2. B) Keep constants the experimental conditions.
   3. C) Randomly assign participants to groups
   4. D) All of the above
7. A study examines the effect of sleep deprivation on test performance. Participants are randomly assigned to either sleep 8 hours or only 4 hours. What is the experimental group?
   1. A) Participants who sleep 8 hours
   2. B) Participants who sleep 4 hours
   3. C) All participants in the study
   4. D) The researcher team