Confident about confidence interval?

Reference — https://online.stat.psu.edu/stat200/lesson/4/4.2

We want to be very confident — 90% confident of the range where true accuracy would lie. Confidence interval would cover 90% of accuracy scores on unseen data.

Confidence interval

Hence, we can say that we are 90% confident that actual accuracy of our decision tree model which show 85% on 200 test instances, would be somewhere in range of 80–89% on unseen data.

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