Friday

January 30, 2015

January 30, 2015

Posted by **Rebecca** on Tuesday, August 30, 2005 at 9:45pm.

I dont know that the diagram is required to be drawn, if you have all the xi, yi.

See http://www.ms.unimelb.edu.au/~s620202/EMS05ch7.pdf

Using Excel, there is a method of doing the scatter plot, then a fitted line, and from that, determining SS.

So, I really guess I cant offer much help....is there another student in your class you can team up with...that is my recommendation.

Why a scatter diagram?

Well, to repeat a phrase, a picture is worth a 1000 words. With a scatter diagram, one can usually see, at an instant, any correlation between the variables x and y.

SS(x), SS(y), and SS(xy) are, by themselves, not very interesting or informative. However, they are components of calculations that are very helpful. So, dividing SS(x) by n-1 gives the sample variance of the x value; a very helpful statistic.

Combining the three statistics, according to your formula, gives r, which is a correlation statistic. r provides a measure of the linear relationship (correlation) between x and y. With a high degree of correlation, one can use values of x to predict values of y -- Which is what regression analyses is all about.

I hope this helps.

**Answer this Question**

**Related Questions**

math - Consider the following bivariate data. Point A B C D E F G H I J x 3 4 2 ...

math help - Can some one help me with this one??? Consider the following ...

math - Consider the following bivariate data. Point A B C D E F G H I J x 3 4 2 ...

statistics - 3. The following data shows expenditures (in millions of dollars) ...

language - okay i read the book Royally Jacked for english and i had to return ...

statistics - These data were generated using the equation y = 2x + 1. A scatter ...

Statistics - A researcher wants to study the effect of gender on mathematical ...

Statistics - Make a scatter diagram with 10 dots showing a perfect positive ...

Statistics - The scatter diagram shows: a. The frequency with which each value ...

math - Trend line, line of best fit and bivariate data, are terms associated ...