How do I find Sxx, Syy, and Sxy on my TI84 graphing calculator?

[smaan]

Hello,

I'm not sure if this is the correct section to post this in, but I need some help with my graphing calculator. I also posted this in the Statistics section.

I am given a set of X and Y data (2 sets of numeric data) and I need to find out how to find the Sxx, Syy, and Sxy in my TI84 graphing calculator. My professor went over it way to quickly in class and I am struggling. Please help!

smaan

 

[jedishrfu]

Here's a site with many TI84 tutorials:

http://calculator.maconstate.edu/calc_topics.html

a couple are on statistics problems.

and here's another more related to statistics:

http://www.radford.edu/~scorwin/courses/200/TI84.html

 

[smaan]

Here's a site with many TI84 tutorials:

http://calculator.maconstate.edu/calc_topics.html

a couple are on statistics problems.

and here's another more related to statistics:

http://www.radford.edu/~scorwin/courses/200/TI84.html[/QUOTE

I appreciate the reply, but both of those links do not help me with my question of obtaining Sxx, Syy, and Sxy.

 

[jedishrfu]

(Can you edit post#3 and add in the closing ] for the quote tag? It will make the quote display correctly.)

This is the best that I can find and its very sparse but may make sense to you:

http://answers.yahoo.com/question/index?qid=20130711085432AAblOxl

On page five of this pdf, it shows how to calculate these values but doesn't show the calculator steps:

http://depts.washington.edu/chemcrs/bulkdisk/chem145HA_aut05/lab_handout_Special_Appendix_A.pdf

and

http://www2.stetson.edu/~mhale/teach/ti84.htm#statistics

Looking at these, I think the problem may be that the s notation is not universally used making it difficult to search on.

Perhaps you can ask a fellow student or better the professor him/her self? They may be using a built-in function or some addon function that you need to include on your calculator and that's why you can't do it.

 

[LudusRex]

,

I understand the importance of accurately and efficiently analyzing data. To find the Sxx, Syy, and Sxy on your TI84 graphing calculator, you will need to follow these steps:

1. Enter your X and Y data into lists on your calculator. Press the "STAT" button and then select "Edit" to enter your data.

2. Once your data is entered, press the "STAT" button again and then select "Calc". Choose "LinReg(ax+b)" and press enter.

3. Your calculator will display a screen with the equation for the line of best fit, as well as several other values including Sxx, Syy, and Sxy. These represent the sum of squares for X, Y, and XY respectively.

4. Press enter to see the numerical values for these sums of squares.

I hope this helps you in finding the Sxx, Syy, and Sxy for your data set. It may also be helpful to refer to your calculator's user manual for further instructions. Good luck with your analysis!