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Table 3 The best estimating formula for an unknown distribution.
From:
Estimating the mean and variance from the median, range, and the size of a sample
Sample Size:
n
≤ 15
15 <
n
≤ 25
25 <
n
≤ 70
70 <
n
Estimate Mean
Formula (5)
Median
Estimate Standard Deviation
Formula (16)
Range/4
Range/6
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