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When we sample with replacement, the two sample values are independent. Practically, this means that what we get on the first one doesn't affect what we get on the second. Mathematically, this means that the covariance between the two is zero. In sampling without replacement, the two sample values aren't independent.
Sample Variance Formula The sample variance formulas for both types of data are specified below: Ungrouped Data: s2 = ?ni=1(xi??)2n?1 ? i = 1 n ( x i ? ? ) 2 n ? 1. Grouped data: s2 = ?ni=1f(mi?¯¯¯x)2N?1 ? i = 1 n f ( m i ? x ¯ ) 2 N ? 1.
For random samples of size n selected from an underlying population with replacement, the variance of the mean of all possible samples is equal to the variance of the underlying population divided by the sample size.
When sampling with replacement the standard deviation of all sample means equals the standard deviation of the population divided by the square root of the sample size when sampling with replacement.
Sampling with replacement is used to find probability with replacement. In other words, you want to find the probability of some event where there's a number of balls, cards or other objects, and you replace the item each time you choose one.