The survey's overall sampling error is plus or minus 3 percentage points.

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The survey's overall sampling error is plus or minus 3 percentage points and plus or minus 6 percentage points for the African-Americans sample.

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First, read a large enough sampling to understand the overall tone.

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It also carries the risk of producing an inaccurate picture of the overall distribution of moisture, as the spots chosen for sampling may be considerably damper or drier than the soil just a few metres away.

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The survey's sampling error is plus or minus 3 percentage points for the overall sample.

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