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.
Line graph. A graphic technique used to illustrate of all the knowledge available about a topic from sources such as books, journal articles, theses, and dissertations. Used to show data over time (days, weeks, months). The x-axis shows the time period and the y axis shows the values and the variable. Nominal data. A type of data that represents values or observations that can be labeled or named and where the values fall into unordered categories; also called dichotomous data.