Tea Tree Oil is used commercially in many products including shampoos, body lotions and toiletries, but there is no legislation requiring manufacturers to state the concentration of tea tree oil in these products.
Line Graphs. One of the most common graphs you will encounter is a line graph. Line graphs simply use a line to connect the data points that you plot. They are most useful for showing trends, and for identifying whether two variables relate to (or correlate with) one another.
Encourage your students to use range, mean, median, mode, and outlier when they describe data sets. When you want to compare data, display it on a bar graph. A double bar graph can be used to compare two sets of data, usually about the same topic. The double bar graph below shows the favorite sports of third and fourth graders.