Everything else is ready: study the parts, the key terms and the quiz below.
From Question to Evidence to Action
Follow the full statistical workflow once before learning its individual tools.
In this lesson5 parts
- 01Service target and target population
- 02Trip record validation and population selection
- 03Median, histogram and duration threshold
- 04On-time rate and empirical cumulative distribution
- 05Decision scope and reproducible analysis
Key terms
The words this lesson introduces, each in one line. The module’s glossary collects them all.
- Unit
- one completed trip. The thing each row, and each count, is about.
- Population
- the trips the decision is meant to cover. In 00.2, completed yellow-taxi trips picked up in Midtown Center on weekdays from 09:00 to 09:59, now and under the same conditions later.
- Scope
- the cases and period the result describes.
- Threshold
- the duration used to decide whether a trip is on time. In 00.2 it is 20 minutes, tested as
duration <= 20. - Numerator
- the trips that meet the condition.
- Denominator
- all eligible trips in the stated question.
- Rate
- numerator divided by eligible denominator.
- Empirical cumulative distribution
- observed fraction at or below each duration.
Quiz 5 questions
Your first pick on each question is the one that counts, and a right one earns a coin. Getting one wrong here is how the lesson sticks.
Practice
Problems to solve in your own notebook. Each states the problem, not the steps: working out the steps is the exercise. Level A applies the lesson, B combines it with earlier ones, C stretches it.
The self-checking notebook for this lesson is From recorded trips to a decision.
Common mistakes
What you will see when it goes wrong, why it happens, and the fix.
Where it’s used
Where this lesson’s ideas turn up in real work.