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Interview question

seniorlevel
8 minsuggested time
2Data scientist, Data analyst

Ancillary attach rate (share of passengers who buy a paid seat or bag) rose in every market segment this quarter, yet the company-wide attach rate fell. The CFO thinks the data are broken. Explain what is happening and how you would show it.

Tests: Recognising Simpson's paradox and mix shift, decomposing an aggregate change into rate and mix effects, and deciding which level answers the business question.

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