4.The results of a hypothetical study to measure test performance of the PCR (polymerase chain
reaction) test for Covid-19 are shown in the following table.
Calculate the (A) accuracy, (B) precision (positive predictive rate, PPV), (C) recall (sensitivity,
true positive rate, TPR), (D) true negative rate (TNR) and (E) F1-measure.
Note: Show the result by rounding up the 3rd digit after the decimal point, e.g. 0.9876 should be
0.988.
【題組】
△FCD 中,̅相交於 E 點,各邊長的數據如圖九所示,則:
38. 如圖八,圓與 x 軸交於 A(-6,0)、B(-2,0)並與 y 軸相切,若圓心之坐標為(a,b),
則a + b = ?
(A) (B) (C) (D)