The table shows the relation between the results of a test, a liver scan, and the correct diagnosis (based on autopsy, biopsy, or surgical inspection).
Relation between results of liver scan and correct diagnosis.
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Correct Diagnosis
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Abnormal Normal
Liver scan (+) (-) Total
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Abnormal(+) 231 32 263
Normal(-) 27 54 81
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Total 258 86 344



Fill in XX and YY in the following sentence: 4 marks total (2 marks each)
“We can thus say that, based on the sample studied, we would expect ........ of patients with abnormal pathology to have abnormal (positive) liver scans, while ........ of those with normal pathology would have normal (negative) liver scans