All the statements are true about standardization, except

Standard population: Is a population where numbers in each age and sex group are known Two frequently used standard populations are: Segi world population European standard population Choice of standard population is arbitrary: Available standard populations may be used Standard population may also be created using 2 populations The national population need not always be taken as the standard population Is commonly used in occupational studies: Comparison of mortality in an industry and general population Can be used for occurrence of disease (rather than death)