1.2.1 Multiple equal precision measurement
If the times N of measurement are labelled as x1,x2,x3,…,xn,the true value is a,then:
(1)Arithmetic mean value:
It can be proved that the arithmetic mean value is the best approximation of the true value of the observed object without systematic error.When n→∞,a≈x.
(2)Mean absolute error of arithmetic mean value:(https://www.daowen.com)
(3)Standard deviation of measurement column:
(4)Standard deviation of arithmetic mean value:
