There were 200 patients in a survey Each was given two separ

There were 200 patients in a survey. Each was given two separate tests, one more blood cholesterol and one for blood sugar. It was found that 45 patients tested positive for blood cholesterol. Of them, 25 tested positive for blood sugar. There were altogether 60 patients who tested positive for blood sugar. Then Prepare a 2x2 contingency table for blood sugar and blood cholesterol

Solution

blood cholestrol positive   blood cholestrol negative

blood sugar positive 25 35 since the total is 60

blood sugar negative 20 120

since total is 45 since total of all is 200