Which of the following statements is correct concerning probability-proportional-to-size (PPS) sampling, also known as dollar unit sampling?
- The sampling distribution should approximate the normal distribution.
- Overstated units have a lower probability of sample selection than units that are understated.
- The auditor controls the risk of incorrect acceptance by specifying that risk level for the sampling plan.
- The sampling interval is calculated by dividing the number of physical units in the population by the sample size.