Which dimension is a correct minimum for a window sample?

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Multiple Choice

Which dimension is a correct minimum for a window sample?

Explanation:
The requirement tests understanding of the minimum size you must use when taking a window wipe sample for lead clearance. The sample area needs to be large enough to be representative and provide enough material for laboratory analysis, which is why a common minimum is 2 inches by 8 inches (16 square inches). Among the options, only the 2 by 8 inch choice meets both minimum dimensions—both width and length are at least the required amounts. The other options fail because either the width is too narrow (1 inch) or the length is too short (6 inches or 4 inches), so they don’t satisfy the required minimum.

The requirement tests understanding of the minimum size you must use when taking a window wipe sample for lead clearance. The sample area needs to be large enough to be representative and provide enough material for laboratory analysis, which is why a common minimum is 2 inches by 8 inches (16 square inches). Among the options, only the 2 by 8 inch choice meets both minimum dimensions—both width and length are at least the required amounts. The other options fail because either the width is too narrow (1 inch) or the length is too short (6 inches or 4 inches), so they don’t satisfy the required minimum.

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