Calculates an estimation of confidence interval for a small or large sample difference of data. Confidence interval for paired means

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- Degrees of Freedom = n - 1
- α = 1 - Confidence%
- σ
_{1}^{2}/n_{1}+ σ_{2}^{2}/n_{2}

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- confidence interval
- a range of values so defined that there is a specified probability that the value of a parameter lies within it.
- difference
- the result of one of the important mathematical operations, which is obtained by subtracting two numbers
- paired means difference