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Thomas Klemm · (This post was last modified: 08-30-2022 04:23 AM by Thomas Klemm.)

(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.

As a side note:

I was puzzled by the fact that register 7 (or t) contains:

Quote:Last x value entered, plus one.

But later it is mentioned:

Quote:Occasionally, when you're dealing with the analysis of 2 sets of related
data, you'll need to "step up" the x variable by one, for each "y"
variable you enter. (For example, for data collected by year — 1961, 1962,
1963, etc.). In this case you only need to enter the first x value, and your
calculator will automatically increment x by one for each y value
entered.

However, this feature isn't mentioned in chapter 9 (LINEAR REGRESSION), where it could be used.