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Interview question

  • midlevel
  • 8 minsuggested time
  • 2Data scientist, Data analyst

A weekly count of baggage-delay complaints averages 40 with a variance of 160 across weeks. A colleague builds a control chart with limits at the mean plus or minus three Poisson standard deviations and the chart keeps alarming. What is wrong, and what would you use instead?

Tests: Count-data modelling: Poisson assumption and overdispersion, consequences for intervals and control limits, and negative binomial or quasi-likelihood alternatives.

day 3day 10

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