
Global Warming  Guided Research Data Analysis 
Creating the Context Home Research Focus Background Info Research Methods Data Submission Results of Study Data Analysis Conclusion Further Research Guided Research Research Question Background Info Research Methods Data Submission Results of Study Data Analysis Conclusion Further Research Research Values Student Research Doing Research Publish View Tools Discussions Email List Warming Links 
So, now that I have my data, what do I do with it? Visualizing Data Graphs are one way to visualize data and to help the researcher look for patterns. A graph is used to show the relationships of data collected from the experiment. Graphs must be constructed accurately and accoring to accepted rules. Usually, a graph shows the relationship between two kinds of data. These data are called variables. In this research the variables are stomatal density and rainfall from January 1st to September 1st. These are two types of variables. The independent variable is data that influences the outcome of the experiment. Often the experimenter has control over this variable. Time is a very common independent variable. This data is plotted in the horizontal axis, x axis. In our research Rainfall is our independent variable. The dependent variable depends on the conditions of the investigation, and frequently on the independent variable. The dependent variable is sometimes refered to as the outcome variable. The dependent data is plotted on the vertical axis, the y axis. In our research the stomatal density of the leaf is our dependent variable. Remeber when you make graphs;
Spreadsheets will offer you a graphing options for your data but it is very important that you understand the graph you have made and that the graph accurately represents your data.
Construct a bar graph of the data for your site (dowload site data under results of the study).
While bar graphs are interesting and a good way to visualize data, they have some problems. This graph does not allow us to really explore the relationship between rainfall and stomatal densities. Construct a twovariable line graph of the data you have downloaded.
Making a Box Plot John Tukey has developed which gives greater prominence to the dispersion, the spread of the data. This method is known as a boxplot, or a boxandwhisker plot. To learn how to construct a boxplot. The following is a boxplot of the data represented in the bar graph and in the line graph.
Hypothesis Testing This research was set up with two hypotheses. The null hypothesis, H0, states that events will not change, not differ and alternative hypothesis, H1, states that events will differ from some baseline standard or control conditions. This change (depen dent variable) predicted by H1 will be due to the occurrence of an experimentally controlled variable (independent variable). The hypothesis for this Guided Research were: H0: There is no measurable relationship between annunal rainfall between January 1st and September 1st and stomatal densities occuring on the leaves of cottonwood tree (Populus deltoides).
Using Geographic Information Systems for Analysis A geographic information system (GIS) is a computerbased tool for mapping and analyzing things that exist and events that happen on earth. The data that we have collected as a part of this project is well suited to GIS technology because it has a critical geographic dimension. GIS integrates common database operations such as query and statistical analysis with the unique visualization and geographic analysis benefits offered by maps. These abilities distinguish GIS from other types of analysis. Mapmaking and geographic analysis are not new, but a GIS performs these tasks better and faster than do the old manual methods. And, before GIS technology, only a few people had the skills necessary to use geographic information to help with decision making and problem solving. A GIS stores information about the world as a collection of thematic layers that can be linked together by geography. This simple but extremely powerful and versatile many realworld problems from tracking delivery vehicles, to recording details of planning applications, to modeling global atmospheric circulation. I would like to work with the data in a mapbased format. 
© 19962006 PathFinder Science 