When conducting random sampling in buildings constructed between 1960 and 1977, how many units should be assessed?

When conducting random sampling in buildings constructed between 1960 and 1977, assessing 10 units is the appropriate choice based on established guidelines for lead risk assessments. This specific number provides a balance between thoroughness and feasibility, ensuring a sufficient sample size for accurately identifying potential lead hazards while considering resource constraints.

Sampling 10 units allows for a comprehensive evaluation of lead exposure risks because it is statistically significant enough to detect patterns and assess the presence of lead-based hazards throughout a building or community. This number helps to capture variability within a specific timeframe and building type, ensuring that the assessment is representative of the entire population of similar units.

In contrast, smaller sample sizes would not provide a reliable snapshot of the conditions in the buildings, as they might miss critical variations that could indicate the presence of lead hazards. Therefore, using 10 units reflects a commitment to safety and thoroughness in assessing lead risks in older buildings.