I have already determined the values of A, B, C and D: A - 139 B - 4 C - 16 D -

Question

I have already determined the values of A, B, C and D: A - 139 B - 4 C - 16 D - 41 As well as the accuracy, specificity and sensitivity, Butt I am uncertain of dhow to approach part B. 3. Three measures of the effectiveness of a test for a given condition are the sensitivity, specificity and accuracy of the test. These are defined as follows, where A, B, C and D are the values in the table, and N is the total population. A D Sensitivity Specificity A C B D Accuracy Condition: Is the condition present? No Yes Positive Test D Negative Urine pregnancy tests may be purchased at pharmacies and conducted at home. As a young scientist, you wonder how the urine pregnancy test compares with the "gold standard" serum beta hCG (pregnancy) test. The following study compares the tests. 200 women who thought they may be pregnant underwent both urine and serum hCG pregnancy tests. The results of the blood test indicated that 155 women were pregnant. Of these, 139 had tested positive on the urine test. There was a total of 57 negative urine tests. (a) Calculate the sensitivity, specificity and accuracy of the urine test (4 marks) (b) After undergoing fertility treatment, a 20% that a woman is pregnant. there is chance Find the probability she is pregnant if she returns a positive urine test result? A marks

Explanation / Answer

B) This could be solved by as below.

P(pregnant after fertility reatment) = 0.2

P(fertility) = 155/200

P(pregnant) = (155/200) * 0.2 = 31/200

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.