CEC Mobile Commerce & App Strategy 4 — Questions and Answers
Question 1: What is the recommended minimum tap target size for mobile ecommerce buttons according to Google's guidelines?
- 20x20 CSS pixels
- 44x44 CSS pixels (Correct answer)
- 60x60 CSS pixels
- 32x32 CSS pixels
Correct answer: 44x44 CSS pixels
Google recommends 44x44 CSS pixels as the minimum tap target size to prevent mis-taps and improve mobile usability.
Question 2: Which mobile analytics event is most critical to track for optimizing a checkout funnel?
- App icon taps
- Screen-by-screen drop-off rates through the checkout flow (Correct answer)
- Total push notification delivery rates
- Number of app screenshots taken
Correct answer: Screen-by-screen drop-off rates through the checkout flow
Tracking drop-off at each checkout screen reveals exactly where friction causes abandonment and where to prioritize fixes.
Question 3: A mobile app's crash-free session rate drops from 99.5% to 97%. What is the immediate business impact?
- App Store ranking improves due to more user activity
- Significant revenue loss and negative reviews as 3% of sessions end in crashes (Correct answer)
- No impact unless the rate drops below 95%
- Only affects Android users
Correct answer: Significant revenue loss and negative reviews as 3% of sessions end in crashes
A 2.5% crash rate means roughly 1 in 40 sessions fails, directly causing revenue loss, churn, and negative App Store reviews.
Question 4: What distinguishes a 'headless commerce' architecture's advantage for mobile apps?
- It removes the need for a shopping cart
- It decouples the front-end from the back-end, enabling custom native app experiences with full commerce functionality (Correct answer)
- It automatically generates a mobile app from a website
- It stores all data locally on the device
Correct answer: It decouples the front-end from the back-end, enabling custom native app experiences with full commerce functionality
Headless commerce lets developers build fully native app UIs while the backend handles commerce logic via APIs.
Question 5: Which mobile engagement metric indicates the strongest signal of long-term customer loyalty in ecommerce?
- 30-day active user rate (MAU)
- Purchase frequency per user per 90 days (Correct answer)
- Total sessions per day
- Push notification open rate
Correct answer: Purchase frequency per user per 90 days
Purchase frequency per user over 90 days directly measures repeat buying behavior, the clearest indicator of loyalty.
Question 6: What is the primary purpose of 'A/B testing' the mobile app's home screen layout?
- To comply with App Store design guidelines
- To determine which layout drives higher engagement and revenue per session (Correct answer)
- To reduce the app's binary size
- To test different icon colors
Correct answer: To determine which layout drives higher engagement and revenue per session
A/B testing the home screen reveals which content hierarchy and design choices maximize clicks, add-to-carts, and revenue.
Question 7: An ecommerce brand launches a mobile loyalty program. Which in-app feature drives the highest repeat purchase rate?
- A static points balance display
- Real-time progress bars showing proximity to the next reward tier (Correct answer)
- Monthly email summaries of points earned
- A referral-only points system
Correct answer: Real-time progress bars showing proximity to the next reward tier
Progress bars showing closeness to the next reward create goal-gradient motivation, proven to accelerate repeat purchases.
CEC Mobile Commerce & App Strategy 4
What is the recommended minimum tap target size for mobile ecommerce buttons according to Google's guidelines?