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Can you trust this number?
One puzzle a week from our practice marketplace. No code — just the question an analyst asks before a number goes into a deck.
Puzzle #4 · 30 seconds · no code
“Paid orders totalled €552,645 in gross merchandise value (GMV).”
Can you infer the platform’s own revenue from that number?
Preparing the practice…
Earlier puzzles
#3 The dashboard says the badge won. What should you do first?
Puzzle #3
A planned 50/50 test recorded 5,978 users in control and 5,663 with the badge. The split check gives p ≈ 0.004; the SRM alert threshold was set at 0.01 before the test.
The dashboard says the badge won. What should you do first?
Preparing the practice…
#2 Orders fell 88% in week 4. What happened?
Puzzle #2
| week | paid orders |
|---|---|
| 1 | 2,625 |
| 2 | 2,751 |
| 3 | 3,289 |
| 4 | 406 |
Orders fell 88% in week 4. What happened?
Preparing the practice…
#1 Which part can the data alone not confirm?
Puzzle #1
“Revenue grew 23% last week, driven by the AUTUMN20 promo.”
Which part can the data alone not confirm?
Preparing the practice…
Learning it properly: Start teaches SQL from zero, free with an account; then case rounds in Atterna Foundations · €19, or Meridian in Atterna Analyst · €59.