Question

define systematic and random errors

Answer 1

Measurement errors can be divided into two components : random error and systematic error. Random error is always present in a measurement. It is caused by inherently unpredictable fluctuations in the readings of a measurement apparatus or in the experimenter's interpretation of the instrumental reading.

Answer 2

Random error is always present in a measurement. It is caused by inherently unpredictable fluctuations in the readings of a measurement apparatus or in the experimenter's interpretation of the instrumental reading. ... Systematic error, however, is predictable and typically constant or proportional to the true value.