This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening, Subject name: Social & Preventive Medicine
Validity of a test is based upon all except 
Select and explain. 
A. Sensitivity, B. Specificity, C. Precision, D. Accuracy
C: Precision
Answer: C: Precision 
Explanation: Ref:Parks 23rd edition pg 138 Validity (accuracy): refers to what extend the test accurately measures which it purpos to measure. has two components: sensitivity and specificity. note: Precision / repeatability / reliability: that is test must give consistent redults when repeated more than once on the same individual or material, under same conditions.