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Confidence intervals of the population mean may be created for the cases when the population standard deviation is known or unknown. How are these two cases treated differently?- Use the z distribution when s is unknown; use the t distribution when s is known.- Use the z distribution when s is known; use the t distribution when s is unknown.- Use the z table when σ is unknown; use the t table when σ is known.- Use the z distribution when σ is known; use the t distribution when σ is unknown.
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