Question: The table below gives for each city, data for blood groups 0 and A on the incidence of peptic ulcer vs control. If we wanted

The table below gives for each city, data for blood groups 0 and A on the incidence of peptic ulcer vs control. If we wanted to estimate P(ulcer|A)-P(ulcer|0), what further information is needed?

Peptic Ulcer Control Group 0 Group A Group 0 Group A London 911 579 4578 4219 Manchester 361 246 4532 3775 Newcastle 396 219 6598 5261

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