Weights and Measures Regulations (C.R.C., c. 1605)

Regulations are current to 2020-05-04 and last amended on 2019-06-17. Previous Versions

SCHEDULE III(Section 52)

PART IIFormula for Determining the Weighted Average Quantity of the Units in a Sample

For the purposes of paragraph 52(4)(a), the formula for adjusting the sample mean to determine the weighted average quantity of the units in the sample is as follows:

Xa = x + s(t÷√n)Footnote *

where

Xa
is the weighted average quantity of the units in the sample
x
is the sample mean calculated as follows:

x = Σx ÷ n

Σx
is the sum of the net quantities of all units in the sample
t
is the value determined in accordance with Part III for the selected sample size
n
is the number of units in the sample
s
is the standard deviation of the sample, calculated as follows:
Σ(x-x)2
is the sum of the squared differences between the sample mean and the net quantity of each unit in the sample.
• Return to footnote *The value of (t ÷ √n) may, instead of being calculated in accordance with this Part, be determined using the applicable value set out in column III of the table to Part III.

PART IIITable for Values of t and (t ÷ √n)

• Return to footnote *Where all units in a lot are selected to constitute a sample, zero shall be used as the value of t and (t ÷ √n).

PART IVMinimum Number of Units for the Purposes of Paragraph 52(4)(B)

• Return to footnote *Minimum number of units in the sample that result in the lot not meeting the requirements of the Act and these Regulations respecting the statement of quantity.

• SOR/89-570, s. 5

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