EXPLORING SCATTERPLOTS
X
-4
-3
-1
1
2
4
Y
-3
-1
1
2
3
5
II. Now, try the same set of data points on a graphing calculator, using the following instructions:
The TI-83 can produce scatterplots. If you have x-values in list L1,
and y-values in list L2, and have the same number of items in each list,
then you can get a scatterplot using STAT PLOT. The first option under
TYPE is a scatterplot. Make sure you have L1 in Xlist and L2 in Ylist.
Then ZOOM 9, which is ZoomStat, will show you a nice scatterplot. You
may want to adjust your window. Answer the following questions:
1. What happens if you have L2 in Xlist and L1 in Ylist?
2. What happens if your two lists do not have the same number of items?
(After you do a successful scatterplot, add a number to one of your lists,
and then try to construct a scatterplot.
III. Lastly, visit the following website:
http://www.ruf.rice.edu/~lane/stat_sim/reg_by_eye/index.html
Follow the instructions and play with the line. After you have a sense of how the line must go, use the data set above (see I) and plot the points on this website: