15M Multiple choice questions 81 to 86 (Each answer is true or false) 81. The re

Question

15M Multiple choice questions 81 to 86 (Each answer is true or false) 81. The repeatability or precisi of measurements ay be measured by: a) the coeflicient of variation of repeated measurements; b etdard deviation of measurements betwee subjects; c) t S1. e standard deviation of the difference between pairs of measurements the standard deviation of rep eated measurements within subjects; difference between the means of two sets of measurements on te se set of subjects. (e) 82. The specificity of a test for a disease: a Standard error derived from the Binobon; asures how well the test, detects cases of the disense; s how well the test. excludes stubjects without the disease: res how often a correct diagnosis is obtained fro the test; all we need to tell us how good the test is.

Explanation / Answer

Ans:

81)

Option d is correct.

Repeatability or test–retest reliability is the variation in measurements taken by a single person or instrument on the same item, under the same conditions, and in a short period of time. A less-than-perfect test–retest reliability causes test–retest variability.

Repeatability is defined as the standard deviation of the individual measurements.

82)

Option c is correct.

measures how well the test excludes subjects without the disease

In medical diagnosis, test sensitivity is the ability of a test to correctly identify those with the disease (true positive rate), whereas test specificity is the ability of the test to correctly identify those without the disease(true negative rate)

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