Which of the following is NOT an approved sampling method for lead inspections?

Convenience sampling is not considered an approved method for lead inspections because it does not ensure a representative sample of the entire population. Instead, convenience sampling relies on easy-to-reach subjects or locations, which can introduce bias and fail to accurately reflect the distribution of lead hazards throughout a property.

In contrast, methods such as random sampling, systematic sampling, and statistical sampling are designed to provide more reliable and valid results by using structured techniques that account for the variability in the environment. Random sampling eliminates selection bias by giving each unit an equal chance of being selected, while systematic sampling involves selecting units based on a predetermined interval, which can help ensure a more representative sample. Statistical sampling applies principles of statistics to determine sample sizes and help make inferences about the larger population with a known level of confidence.

The rigor associated with these accepted methods is essential for accurately assessing lead hazards and ensuring safety in environments where lead exposure is a concern.