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Why Do You Subtract 1 From A Sample? [Solved]
So why do we subtract 1 when using these formulas? The simple answer: the calculations for both the sample standard deviation and the sample variance both contain a little bias (that’s the statistics way of saying “error”). Bessel’s correction (i.e. subtracting 1 from your sample size) corrects this bias.
Math Antics - Subtracting Mixed Numbers
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Review and intuition why we divide by n-1 for the unbiased sample | Khan Academy
Reviewing the population mean,
Grade 6 Mathematics Unit 9 - Fractions Part 2
Subtract 1
