random sampling
random sampling means that members of `population`have a equal chances of being selected. each individual is chosen entirely by chance and each member of population has a known, but not equal, chance of being included in the sample. random sampling is the key factor of statistics.
for example, in random sampling if these random numbers are generated by a calculator:
017, 029, 300, 914, 037, 849, 111, 559, 333, 400, 598, 255.
use these to make up the list of numbers to select a sample:
0 1 7 0 2 9 3 0 0 9 1 4 0 3 7 8 4 9 1 1 1 5 5 9 3 3 3 4 0 0 5 9 8 2 5 5.
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