When finding Confidence Intervals for Proportions we typically involve the Normal Distribution to create an confidence Interval estimate.
However, this method requires the conditions np<5 and n(1-p)<5 to be fulfilled.
It is not uncommon to have a large sample size n available which likely disables this method.
This is where the Bliss Method comes in to find the exact Confidence Interval on the TiNspire.
It involves the F-Distribution instead.
Using Statistics Made Easy at www.TiNspireApps.com use menu option 6 then 8 to perform the Bliss method step by step.