High and Low Method:
You take the highest and Lowest of 2 points in a set of data and divide it by its denominators. The denominators are determined by the relevance to their numerators.
http://www.allbusiness.com/glossaries/high-low-method/4948480-1.html
Scatter Graph Method:
You simply draw a dot for each data you collected from a data group and draw a line by visualizing where the trend is.
http://www.google.com/imgres?imgurl=http://www.statcan.gc.ca/kits-trousses/images/scatterGraph.jpg&imgrefurl=http://www.statcan.gc.ca/kits-trousses/univer7-eng.htm&usg=__yrP5NGcqIE1jSqES21DS2zRch3I=&h=488&w=513&sz=177&hl=en&start=2&sig2=2Md9netyg2UHooVIA1cG_w&um=1&itbs=1&tbnid=5oZD435P5jQ8HM:&tbnh=125&tbnw=131&prev=/images%3Fq%3Dscatter%2Bgraph%26um%3D1%26hl%3Den%26safe%3Doff%26sa%3DX%26tbs%3Disch:1&ei=V7PaS-CZFpzGswOKt7Bu
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