Which of the Statements Is True, Relative to Error

Which of the statements is true, relative to error?

A) True score plus error score equals observed score.
B) Random error of measurement increases the mean.
C) The mean of the true measurements is equal to the mean of the observed measurements when there is no systematic error.
D) No measurement of anything is ever correct.
E) Measurement error always exists, if a straightforward measurement like counting is made often enough and by enough people.

Correct Answer:

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