Understanding the Basics :Designing, Running, and Analyzing Experiments(Interaction Design Specialization) Answers 2026

Question 1

Why can’t we confidently compare only means?

❌ We can, provided the means are really big
❌ We can, provided the means are really different
❌ We can, but we need to know every score
✅ We can, but we need to know the spread of scores around those means as well
❌ None of the above

Explanation:
Means alone hide variability. Variance/standard deviation is essential to judge reliability.

Question 2

When are more participants most helpful?

✅ When differences are present but relatively small, more participants increase statistical power
❌ When differences are large
❌ When differences are absent to avoid false claims
❌ When differences are absent to make results convincing
❌ None of the above

Question 3

A practically significant difference can be determined the same way as statistical significance.

❌ True
✅ False

Explanation:
Practical significance depends on real-world impact, not statistics alone.

Question 4

Which is a type of probability sampling?

❌ Snowball sampling
✅ Random stratified sampling
❌ Convenience sampling
❌ Purposive sampling
❌ None of the above

Question 5

Which is best described as an exclusion criterion?

❌ Only include males aged 18–25
❌ Only include people in developing nations
✅ Exclude people who have used the website before
❌ Exclude everyone not aged 18–25
❌ None of the above

Explanation:
Exclusion criteria specify who is not allowed to participate.

Question 6

Logging data via computer-generated files concerns which aspect?

❌ Participants
✅ Apparatus
❌ Procedure
❌ Design & Analysis
❌ None of the above

Question 7

Informed consent gives participants power to choose whether to proceed.

✅ True
❌ False

Question 8

Which pertain to the procedure of an experiment? (Select all that apply)

✅ How many trials a participant performs
✅ How long each trial should take
❌ A VR headset worn by participants
✅ A think-aloud protocol
❌ The pointing device used

Explanation:
Procedure = what participants do and how the study runs, not the hardware.

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