Random sampling of multi units ensures what property of unit selection?

Random sampling of multi units ensures what property of unit selection?

• A. Insures selection of the units is not influenced by preconceived notions or convenience.
• B. Guarantees equal testing time for all units.
• C. Prevents testing of any exterior surfaces.
• D. Eliminates the need for testing in common areas.

Answer: (A)

Random sampling is about preventing bias in which units are chosen for testing. By giving every unit in the building a fair, chance-based shot at being included, the selection isn’t steered by the inspector’s preconceived notions or by what's easiest to reach. This makes the results more representative of the whole property rather than just a subset that’s convenient. It’s not about how long each unit is tested or about which surfaces or areas are tested—that’s handled by other parts of the process.

Random sampling is about preventing bias in which units are chosen for testing. By giving every unit in the building a fair, chance-based shot at being included, the selection isn’t steered by the inspector’s preconceived notions or by what's easiest to reach. This makes the results more representative of the whole property rather than just a subset that’s convenient. It’s not about how long each unit is tested or about which surfaces or areas are tested—that’s handled by other parts of the process.