two great sites for extra scatter plot practice

http://www.mathsisfun.com/data/scatter-xy-plots.html

 

Scroll to bottom of this site and answer the 10 practice questions. 

http://www.mathopolis.com/questions/q.php?id=3072&site=1&ref=/data/scatter-xy-plots.html&qs=3072_3073_3074_3075_3772_3773_3774_3775_3776

additional ordered pair practice:  http://mrnussbaum.com/stock-the-shelves-ipad.html