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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.
There is a 4 in 52 probability (reduce to 1 in 13) of drawing a '3' from a 52-card deck.
13/52, or 1/4.
What do you mean? LIke for example, if you have a bag with the follow: 888887777775 The probability would be 11/12 666778999999 The probability would be 1/4 (3/12) You take the number in total and that is your denominator(Number on bottom) You take the total number of sevens and eights and that is you numerator(Number on top) Than reduce as needed.
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