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1 Confidence Intervals for Means

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2 When the sample size n< 30 case1-1. the underlying distribution is normal with known variance case1-2. the underlying distribution is normal with unknown variance case1-3. the underlying distribution is not normal When the sample size n case2-1. the variance of underlying distribution is known case2-2. the variance of underlying distribution is unknown

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3 case1-1. the underlying distribution is normal with known variance

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5 case1-2. the underlying distribution is normal with unknown variance

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7 case1-3. the underlying distribution is not normal

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8 case2-1. the variance of underlying distribution is known

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9 case2-2. the variance of underlying distribution is unknown

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