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Matt Agajanian · (This post was last modified: 08-30-2022 05:14 AM by Matt Agajanian.)

(08-30-2022 03:57 AM)Thomas Klemm Wrote:
(08-30-2022 02:20 AM)Matt Agajanian Wrote: What am I missing?

Reading the manual.

On page 2.22 it states:

Press [INV] [2nd] [\(\bar{x}\)] to calculate the mean of the "x" data points.

Press [2nd] [\(\bar{x}\)] to calculate the mean of the "y" data points.

That's not intuitive on multiple levels.
But it was probably okay, once you knew it.

It does take some mental gymnastics to condition yourself to memorize those keystrokes.

I wonder why TI did not use the same 58/59 x x<>y y Σ+ method for data entry and the same mean & standard deviation output order and the x<>t key on the 57. It seems odd that pressing the mean or variance key would display the y variable results and then INV (mean or variance) would displace the x results. I agree with you, the 57’s strategy is not intuitive. I don’t know why TI didn’t use the x<>t approach on the 57. What is equally odd is why is there a variance function on the keyboard instead of the usual standard deviation function.