When σ is unknown and the sample size n is not large enough, which distribution should be used to construct a confidence interval on the true mean of population?

Question

When σ is unknown and the sample size n is not large enough, which distribution should be used to construct a confidence interval on the true mean of population?

Answer

standard normal distribution (Z)

Answer

a t-distribution (T)

Answer

a chi-square distribution (X 2 )

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When σ is unknown and the sample size n is not large enough, which distribution ...

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