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Here we are, our last two voodoo steps on our way to calculating the Confidence Interval. H.M. Walker said it well:
"For the person who is unfamiliar with N-dimensional geometry or who knows the contributions to modern sampling theory only from secondhand sources such as textbooks, this concept often seems almost mystical, with no practical meaning."
Indeed! But again, while the concepts are a little rough but the calculation is pretty simple.
| Calculated Data | Symbol | Formula | Value |
|---|---|---|---|
| Degrees of Freedom | df | n-1 | 10-1 = 9 |
| t-Statistic | t* | use a t-table or Excel function [=tinv(α,df)] |
2.262 |