What is the mathematical formula for the pooled variance of two populations?

Jefferson Booth

Jefferson Booth

Answered question

2022-11-18

What is the mathematical formula for the pooled variance of two populations?

Answer & Explanation

Kaeden Lara

Kaeden Lara

Beginner2022-11-19Added 23 answers

The pooled standard deviation is given by
S p = ( n 1 - 1 ) s 1 2 + ( n 2 - 1 ) s 2 2 n 1 + n 2 - 2
for variance remove the sqare root operator
V p = ( n 1 - 1 ) s 1 2 + ( n 2 - 1 ) s 2 2 n 1 + n 2 - 2

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