Everything else is ready: study the parts, the key terms and the quiz below.
Project Lab: Audit a Business Claim
Reproduce, diagnose and rewrite a misleading but realistic statistical claim from a chart and its underlying data.
In this lesson6 parts
- 01Recreate the constructed slide faithfully
- 02Count what the slide actually shows
- 03Build the missing denominator
- 04Inspect missing IDs and the source's reach
- 05Repair the display and assemble the audit
- 06Reproduce and hand off the report
Key terms
The words this lesson introduces, each in one line. The module’s glossary collects them all.
- unit of analysis
- The entity counted once for the stated result: one gross positive invoice.
- declared filter
- An explicit rule selecting rows for a calculation.
- percentage change
- Difference divided by the starting value, expressed per hundred: 21.57% for 255 to 310.
- truncated axis
- An axis whose shown range starts above the quantity's zero point, here a constructed floor of 240.
- rate denominator
- The group total used beneath the numerator for a stated comparison: that week's distinct active identified customers.
- missing identifier
- A recorded event whose entity link is absent: an invoice with no customer ID.
- time window
- The exact interval of records included in a comparison.
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 Stats 2.1, 2.2 and 2.7 · EDA and a chart audit.
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.