Measure and improve
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The idea in everyday life
Use the supplied visitor-trial fixture to practice making a decision from a clearly defined numerator and denominator. README section 6 separates simulated before-and-after results from real visitor observations. Calculate the rates, state the limits of the comparison and choose one measurable change for a later test.
A site is a hypothesis: visitor, message, action, and measurable result.
One step at a time.
Use the sample or information you have permission to use. Keep your work as you go. You can pause between steps.
- 1
Open visitor-trials.csv in the supplied pack. Label it simulated: 20 attempts with 12 completed plans before clearer grade copy; 20 with 16 afterward.
- 2
Calculate completions / attempts and percentage-point change. Keep attempts, completions, rates, period and uncertainty together; compare with expected-results.md.
- 3
Propose one experiment: an input example, target at least 17/20 completions with no increase in invalid attempts, same task and sample size. Keep the fixture-based scorecard and prioritized backlog.
- 4
Optional extra fieldwork: collect anonymous real task attempts/feedback or a real monthly scorecard with actual dates. Third-party analytics, search-console verification and custom domains are optional; never present the fixture as live visitor data.
See how it works.
The supplied fictional tally gives 12/20 = 60% before and 16/20 = 80% after, a 20-percentage-point increase. This small fixture does not prove a causal effect. Next test: an input example, target 17/20 or 85%, same task and denominator. Mark real monthly measurement as additional elapsed fieldwork.
Did you cover these?
- The simulated scorecard shows 60%, 80% and +20 percentage points with denominators.
- The next experiment states one change, a 17/20 target and comparable task conditions.
- Fixture results and any real visitor observations are explicitly distinguished.
What to finish
A clearly labeled simulated visitor scorecard, one prioritized experiment and a template for optional real monthly observations.
Watch for this
Optimizing vanity traffic while the real action remains unclear or broken.
How can I tell I understand it?
You can name the site’s primary metric and the visitor behavior that produces it.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
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Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.
Go to the knowledge checkOptional course overview video · same video as Lesson 1
Full Stack Web Development for Beginners
From freeCodeCamp.org. Watch here or open it on YouTube .
After the optional video reaches a working site, ask which visitor action would demonstrate success and compare that idea with your fixture-based scorecard.Tools, templates, and lesson sources
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Sources and further reading
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