Explain what a retention chart leaves out
Define denominators and communicate uncertainty
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Assignment preview
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The brief
Prepare a one-page product note about fictional learning cohorts. Calculate day-seven retention and explain why a chart of returning users alone could mislead the reader.
Your source packet
Fictional source notes for this exercise. No outside client data.
CSV input: cohort,new_learners,day7_returners May,40,16 June,80,24 July,50,20 Day-seven returner means a new learner who opened at least one assignment on the seventh day after joining. This is an activity measure; it does not measure assignment quality or learning improvement. Cohorts had different acquisition channels, but channel-level data is unavailable.
What to deliver
- A labelled retention-rate chart and the underlying calculation table
- A 250–350 word interpretation
- Two additional measurements needed before changing the product
Check your understanding
- What is the denominator for June’s rate?
- Does opening an assignment establish that learning happened?