All the statements are true about standardization, except
Standardization allows comparison to be made between two different populations
The national population is always taken as the standard population
For direct standardization age specific rates of the study population are applied to that of the standard population
For indirect standardization age specific rates of the standard population are applied to the study population
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)