Council Directive of 20 January 1976 on the approximation of the laws of the Member States relating to the making-up by weight or by volume of certain prepackaged products (76/211/EEC)

2.3.1. A batch of prepackages shall be considered acceptable for the purpose of this check if the mean value of the actual contents x_i of n prepackages in a sample is greater than the value: U.K.

In this formula:

Q_n

=

the nominal quantity of the prepackage,

n

=

the number of prepackages in the sample for this check,

s

=

the estimated standard deviation of the actual contents of the batch,

t_{(1 — α)}

=

0.995 confidence level of a Student distribution with ν = n — 1 degree of freedom.