Mathematics, 24.01.2021 01:00 layla07

A new drug to control blood pressure was given to 1,000 patients. Another 1,000 patients were given a placebo. The result showed that 750 of the patients receiving the new drug had a decrease in blood pressure. For the group that received the placebo, 228 had a decrease in blood pressure. The results are shown in the following Venn diagram. A diagram is composed of two overlapping circles contained in the interior of a rectangle. The leftmost circle is labeled "Received new drug" and the rightmost circle is labeled "Reduced blood pressure". Numbers are given in different regions. They are listed as follows:

"Received new drug" only: 250

"Reduced blood pressure" only: 228

"Received new drug" overlapping with "Reduced blood pressure": 750

Region in the rectangle outside both circles: 772

QUESTION: How many false negatives occurred?

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