Mathematics · Statistics

10 units are chosen by simple random sampling without replacement from a population of size 100. Consider the sample variance s 2 = 1 10 ∑ i=1 to 10 (y i - ȳ) 2 . An unbiased estimate of the population variance σ 2 = 1 100 ∑ i=1 to 100 (Y i - Ȳ) 2 is:

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10 units are chosen by simple random sampling without replacement from a population of size 100. Consider the sample variance s 2 = 1 10 &sum; i=1 to 10 (y i - y&#772;) 2 . An unbiased estimate of the population variance &sigma; 2 = 1 100 &sum; i=1 to 100 (Y i - Y&#772;) 2 is: