1. Data Collection

Experimental Design — Quiz

Test your understanding of experimental design with 5 practice questions.

Practice Questions

Question 1

Which principle of experimental design helps to ensure that any observed differences between treatment groups are due to the treatment itself and not to pre-existing variations among the subjects?

Question 2

In an experiment, what is the primary purpose of a control group?

Question 3

A researcher conducts an experiment to test the effectiveness of a new teaching method. They apply the new method to one class and use the traditional method in another class. To strengthen the validity of their findings, they repeat this experiment with five different pairs of classes. This repetition is an example of which experimental design principle?

Question 4

Which of the following best describes a confounding effect in experimental design?

Question 5

In an experiment investigating the effect of different types of soil on plant growth, a researcher divides the plants into groups based on their initial height and then randomly assigns soil types within each height group. This technique is an example of: