A Black Belt would use non-parametric statistical methods when:
OPTIONS
- knowledge of the underlying distribution of the population is limited
- the measurement scale is either nominal or ordinal
- the statistical estimation is required to have higher assurance
- management requires substantial statistical analysis prior to implementation
ANSWER
the measurement scale is either nominal or ordinal
EXPLANATION
A Black Belt would use non-parametric statistical methods when the measurement scale is either nominal or ordinal
