Question

*Based on the information provided, which of the following expresses the SPECIFICITY of this test:The next two questions refer to the following information:A screening examination was performed on 250 persons for Factor X, which is found in disease Y. A definitive diagnosis for disease Y among the 250 persons had been obtained previously. The results of diagnoses are charted here:Test ResultsDisease PresentDisease AbsentPositive for Factor X40 60Negative for Factor X10 140

Answer 1

The specificity of this test is 70%.

Step-by-step explanation:

The specificity of a test refers to the probability of getting a negative test result when the patient is not infected. It represents the ability of the test to correctly identify individuals who do not have the disease. In the given information, the table shows that there were 60 people who were disease absent and tested positive for Factor X. So, the specificity of this test can be calculated as:

Specificity = Number of true negatives / (Number of true negatives + Number of false positives) = 140 / (140 + 60) = 0.7 or 70%

Learn more about specificity of a test