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If the population standard deviation (σ) is known, the formula for a 95% confide...

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If the population standard deviation (σ) is known, the formula for a 95% confidence interval for the mean is:

X̄ ± Zα/2 · (σ/√n)

✅

X̄ ± tα/2, n-1 · (S/√n)

X̄ ± σ · √n

X̄ ± Zα/2 · (S/n)

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