Explain Cohort Analysis to a Non-Technical Manager

A manager wants to know why you don't just average the numbers, and they don't speak stats. This explains cohorts with a real-world analogy, shows what cohort analysis reveals that an average hides, and ties it to the outcome they care about. You give it the metric and they walk away actually understanding, not just nodding.

<context>
A non-technical manager has asked why the team uses cohort analysis instead of simple averages when measuring [business outcome, e.g. retention / LTV / engagement]. They are familiar with spreadsheets but not statistics.
</context>

<task>
**Explain cohort analysis clearly and concisely**:
1. Define a cohort in one sentence using a real-world analogy
2. Explain what cohort analysis reveals that aggregate metrics hide
3. Walk through a simple numerical example using [business context, e.g. weekly sign-up cohorts]
4. Describe one decision the manager could make better with cohort data than without it

**Avoid jargon**; if a technical term is unavoidable, define it immediately.
</task>

<output_format>
- Conversational prose with clear paragraph breaks
- Include a small 3-row x 3-column example table
- End with a one-sentence takeaway the manager can repeat to others
</output_format>