How many baseline measurements are required before and after testing under ASTM E3158 - 18?

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The correct answer indicates that 12 baseline measurements are required before and after testing under ASTM E3158 - 18. This standard emphasizes the importance of having a statistically significant number of measurements to ensure that the data collected is reliable and can be used to accurately assess the airtightness of the building being tested.

Having 12 baseline measurements allows for a robust analysis by providing a comprehensive view of leakage patterns and potential variability in airtightness during the testing period. This practice also aids in minimizing the margin of error in the overall results, ensuring that any identified leakage pathways can be addressed effectively.

The selection of 12 measurements reflects a balance between practicality and statistical validity, allowing for sound conclusions to be drawn from the data collected. This level of detail in measurement helps in establishing a consistent baseline that can be rigorously compared with post-test results, facilitating a clearer identification of the effects of any changes made to improve the building's airtightness.

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