Pooled variance calculator

Confidence Intervals for μ 1 − μ 2: Pooled Variances. When we have good reason to believe that the variance for population 1 is equal to that of population 2, we can estimate the common variance by pooling information from samples from

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Pooled Variance Calculator

Here is how to calculate the pooled variance between the two samples: sp2 = ( (n1-1)s12 + (n2-1)s22 ) / (n1+n2-2) sp2 = ( (40-1)*18.5 + (38-1)*6.7 ) / (40+38-2) sp2 = (39*18.5 +
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Pooled Variance Calculator

Variance = σ 2 = ∑ i = 1 n ( x i − μ) 2 n For a Sample Population divide by the sample size minus 1, n - 1 Variance = s 2 = ∑ i = 1 n ( x i − x ¯) 2 n − 1 The population standard deviation is the square root of the population variance.
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