Question

What always affects measurement error in an experiment?

A.investigator bias
B.variability in nature
C.instrument precision
D.misreading the instrument

Answer 1

C. Instrument precision

This is because if one constantly uses a ruler which says 2 CM that is actually 1 CM it will create a constant error. However, the other options may create errors in some measurements while not in others.

Answer 2

These are all actually affect the measurement error in an experiment. But of course misreading the instrument ALWAYS affect measurement error. So, the best option will be the D i.e; misreading the instrument.