Increase sample size.
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With probability sampling you have no control over the units that are sampled. So the only way to reduce the margin of error is to increase the size of the sample.
The margin of error is reduced.
A margin of error refers to a small allowance for mistakes. Any errors or miscalculations in circumstances cannot exceed this tiny amount.
Yes
The larger the sample, the lower the % error.. so to reduce a % error, increase your sample size.