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The best way to reduce sampling error is to use random sampling in the study. This means selecting the population to study through a random process. This will ensure that each member of the population under study has an equal chance of being selected.
simple random sampling
I just programmed a small software and find a 75,6% of two cards beein next to each other in 15 million random generated decks.
.5cm/.5cm/.005g
Random assignment: assigning participants to experimental and control conditions by chance Vs. Random sample: a sample that fairly represents a population because each member has an equal chance of being included You decide :-D