Tests of Stability Reliability, Such as Test-Retest, Can Reveal Random

Tests of stability reliability, such as test-retest, can reveal random measurement error. Why is systematic measurement error not revealed when stability reliability determinations are made?

A) Actually, reliability testing does not reveal the type of error: differences on test-retest can indicate problems with both random and systematic measurement error.
B) Tests of stability reliability are not powerful enough to pick up systematic measurement error because of its subtlety.
C) If an instrument systematically measures all blood pressures 10 points high, it will do so both at baseline and on retesting.d.The direction of the systematic measurement error is reversed on retesting, so it is not visible in the statistical analysis.

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