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  "body": "\n## Summary\n\nA simple random sample of size $n$ from a finite population is a random subset of $n$ units.\nIt is chosen so that every subset of size $n$ is equally likely.\nIt is the basic design of survey sampling, against which other designs are compared.\nUnder it, the sample mean is an unbiased estimator of the population mean with an explicit variance.\n\n## Explanations\n\n### L1 human\n\nWrite the name of every member of the population on a ticket, mix the tickets well, and draw $n$ of them without putting any back.\nThe people drawn form a simple random sample.\nEvery person has the same chance to be chosen, and moreover every group of $n$ people has the same chance to be the sample.\nFor instance, from $4$ people, a sample of $2$ is one of $6$ possible pairs, each with probability $1/6$.\n",
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