Stats: Need help understanding where the sum of x^2 comes from

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Discussion Overview

The discussion revolves around understanding the origin of the sum of squares of a set of values, specifically in the context of a homework problem. Participants are seeking clarification on how to derive the specific numerical values mentioned in the problem statement.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant expresses confusion about the source of the sum of squares values (2431.72, 4901.66, and 3252.44) and seeks assistance in understanding them.
  • Another participant asks what attempts have been made to calculate Sum(x) and Sum(x^2), indicating a focus on the calculations involved.
  • A third participant suggests that the method involves squaring each number and then summing them, implying a straightforward approach to finding Sum(x^2).

Areas of Agreement / Disagreement

The discussion appears to be unresolved, with participants providing different levels of guidance without reaching a consensus on the specific calculations or methods to derive the sums.

Contextual Notes

There is a lack of clarity on the definitions and assumptions regarding the values being summed, as well as the specific context of the homework problem.

smaan
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Homework Statement



I have no idea where the sum of x^2 comes from, from the information I posted. I know it must be something pretty simple but its completely going over my head. In the picture that I've attached, I am wondering where the 2431.72, 4901.66, and 3252.44 come from. Thank you for any help.


Homework Equations





The Attempt at a Solution

 

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What did you try to get Sum(x)? Sum(x^2)?
 
SteamKing said:
What did you try to get Sum(x)? Sum(x^2)?

I tried squaring x, but obviously that is not correct.
 
Did you try, you know, adding up the columns of figures? That's what Sum(x) means. The other one is trickier: you've got to square each number, and then add them up.
 
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