Cumulative Quiz :Design Principles: an Introduction (Interaction Design Specialization) Answers 2026

Question 1

Key lesson from the Obama campaign website experiment:

❌ Ask people for money as soon as possible
❌ The best method is to use intuition
✅ Use data because our assumptions are often wrong
❌ Use data from other websites

Explanation:
The experiment showed that data-driven decisions outperform intuition.

Question 2

A between-subjects experimental design:

✅ Each participant uses only one of the systems
❌ Each participant uses all systems

Question 3

The Think Aloud method involves:

✅ Users explain what they are doing during the task
❌ Debriefing only at the end
❌ Talking before the experiment
❌ Team-building exercises

Question 4

Appropriate null hypothesis for the Highrise A/B test:

❌ Design A is different from Design B
✅ Design A and Design B have the same signup rate

Question 5

When is an MTA-style map more useful? (Select all that apply)

✅ Counting the number of stations
❌ Finding a route from Manhattan to JFK
❌ Finding the southernmost station
❌ Choosing the physically shortest route
❌ None

Explanation:
Schematic maps are best for station counting and route logic, not distance.

Question 6

User clicks OK instead of saving changes:

❌ Mistake
✅ Slip
❌ None
❌ Both

Explanation:
The user’s intention was correct, execution was wrong.

Question 7

How to fix the dialog box error:

✅ Rewrite message and label buttons clearly (“Save” / “Don’t Save”)
❌ Move Cancel button
❌ Set default to Cancel

Question 8

Clicking “No” instead of “Yes” because buttons are too close:

✅ Slip
❌ Mistake
❌ Both
❌ None

Question 9

How to prevent this error? (Select all that apply)

❌ Add another confirmation dialog
❌ Change “yes” to “do not erase”
✅ Move the buttons further apart

Question 10

To shorten scan time on a German webpage, text should be:

❌ Right-aligned
✅ Left-aligned
❌ Centered
❌ Staggered

Question 11

Ways to differentiate related/unrelated info (Select all that apply)

✅ Indent sub-groups
✅ Leave white space between groups
✅ Put a box around related information
✅ Insert a blank line between groups

Question 12

True statements about ordering effects (Select all that apply)

✅ Can occur due to learning/practice
❌ Can only be prevented with two conditions
❌ Fatigue does not contribute
✅ Later results are influenced by earlier tasks

Question 13

Helps reduce gap between users & designers (Select all that apply)

❌ Non-destructive operations
✅ Discoverability
✅ Visibility
❌ Reliability

Question 14

What the refrigerator example illustrates (Select all that apply)

❌ All users have the same mental model
❌ Turning dial colder always affects freezer
✅ Users make mistakes due to different mental models
✅ Users develop mental models through interaction

Question 15

Closing the wrong browser window accidentally:

✅ Slip
❌ Mistake
❌ Both
❌ Neither

Question 16

Examples of direct manipulation (Select all that apply)

✅ Dragging a file into trash
❌ Making notepad look realistic
✅ Editing address inline
❌ VR code navigation

Question 17

A/B test with p = 0.04 at α = 0.05:

❌ Fail to reject null
❌ Chance alone explains it
✅ Reject the null hypothesis
❌ 40% probability explanation

Question 18

Incorrect statement about visual design:

❌ Whitespace conveys grouping
✅ Right-aligned text is faster to skim
❌ Typography, layout, color are basic tools
❌ High x-height improves small-size readability

Question 19

Correct null hypothesis for Highrise headline test:

❌ A ≠ B
❌ A > B
❌ A < B
✅ A = B

Question 20

Independent vs dependent variable:

❌ Signup rate; Time on page
❌ Headline; Time on page
❌ Signup rate; Headline
✅ Change in headline; Percentage of people who sign up

🧾 SUMMARY TABLE