BS 6065:1981

National foreword
Cooperating organizations
Methods
1 Scope and field of application
2 Statistical terminology and symbols
3 General considerations and preliminary conditions
    for sampling
4 Sampling for non-destructive tests
5 Sampling for destructive tests
6 Report on sampling
Annexes
A Determination of the arithmetic mean and standard
    deviation of a production
B Comparison of the means of two samples
C Equations used for calculating the values given in
    the tables
D Bibliography
Tables
1 Change in risks when the number of independent
    properties inspected increases
2 Inspection process
3 Single sampling plans for sampling by attributes in
    normal inspection
4 Single sampling plans in the case of a guaranteed
    value for the mean
5 Conformity decisions
6 Sequential sampling plans in the case of a
    guaranteed value limit (mu G) for the mean and a
    known standard deviation
7 Development of sequential sampling plan
8 Development of sequential sampling plan
9 Single sampling plans with a fixed unilateral limit
    for the individual values and a known standard
    deviation
10 Single sampling plans with a unilateral limit fixed
    for the individual values and an unknown standard
    deviation
11 Confidence interval of mu and sigma for different
    sizes n
12 Values for the quantity g for the purpose of
    comparing the means of two samples of the same size
    n
Figures
1 Example of operating characteristic curves when
    several properties are investigated simultaneously
2 Operating characteristic curves for single sampling
    plans defined in table 4: testing for a guaranteed
    value of the population mean when the standard
    deviation is known
3 Procedure for decision on conformity
4 Operating characteristic curves of single sampling
    plans of table 9 for AQL = 1.5 %: fixed unilateral
    limit for individual values and known standard
    deviation
5 Operating characteristic curves of single sampling
    plans of table 9 for an AQL = 2.5 %: fixed
    unilateral limit for individual values and known
    standard deviation
6 Operating characteristic curves of single sampling
    plans of table 9 for an AQL = 4.0 %: fixed
    unilateral limit for individual values and known
    standard deviation
7 Operating characteristic curves of single sampling
    plans of table 9 for an AQL = 6.5 %: fixed
    unilateral limit for individual values and known
    standard deviation

Details methods for sampling products and for obtaining from a sample of the smallest possible size the most precise assessment possible of the quality of a consignment. See also BS 6434.

This International Standard gives directives for sampling shaped refractory products and for obtaining, from a sample of the smallest possible size, the most precise assessment possible, of the quality of a consignment.

The methods described below make it possible to carry out an acceptance test based on an assessment of the extent to which the specifications have been observed, but do not make it possible to determine whether the accepted consignment is suitable for a given application or to compare different qualities of parts for this same purpose.

This International Standard applies to products manufactured from refractory materials.

It may be applied when the parties concerned have agreed to do so and have therefore, by common consent, made a choice between the various possibilities put forward in this International Standard, and have specified the various parameters (see 3.2) which must be defined in order to permit the application of the methods described.

It is also possible to apply the directives forming the subject of this International Standard while modifying, by prior agreement between the parties concerned, those values which, particularly in the tables, do not follow from statistical laws (see 3.3).