Full-Stack Development Research & Evidence-Based Practice 3

Question 1

Which type of study provides the strongest evidence when deciding to adopt a new frontend framework?

Accepted Answer

A systematic review or meta-analysis of multiple controlled studies

Answer

Systematic reviews aggregate evidence across multiple studies, reducing the bias and noise of individual reports.

Question 2

In an A/B test for a checkout UI change, the experiment runs for two days and shows 95% confidence. Why might a developer wait longer?

Accepted Answer

Short windows miss weekly traffic cycles and novelty effects that inflate early results

Answer

Traffic patterns vary by day of week, and novelty effects can make new UIs appear better initially; longer windows produce more reliable estimates.

Question 3

A developer uses feature flags to roll out a backend change to 5% of traffic. This practice is best described as:

Accepted Answer

Canary deployment used as a controlled experiment

Answer

Rolling a change to a small traffic slice (canary) allows real-world validation with limited blast radius before full rollout.

Question 4

When conducting a usability study, a researcher notices users struggle with a form but does not intervene. This approach is called:

Accepted Answer

Summative evaluation with observer effect control

Answer

Refraining from intervening during observation is critical to avoid the observer effect distorting how users naturally interact with the interface.

Question 5

Which RFC (Request for Comments) process principle is most relevant when a team debates adopting a new internal API standard?

Accepted Answer

A formal proposal with stated motivation, trade-offs, and review period builds consensus and documents decisions

Answer

RFC-style processes surface trade-offs, collect stakeholder feedback, and create a durable record of why decisions were made.

Full-Stack Development Practice Test