Types of Graphs Creating a Graph With Microsoft Excel

Line Graphs Line graphs compare two variables (One is usually time) Given one variable the other can easily be determined Show trends in data and show how one variable is affected by the other as it increases or decreases They enable the viewer to make predictions about the results of data not yet recorded

Bar Graphs Make comparisons between different groups (variables) very easy to see.

Scatter plot graphs Use horizontal and vertical axes to plot X-Y data points Scatter plots show how much one variable is affected by another. The relationship between two variables is called their correlation. Scatter plots usually consist of a large body of data. The closer the data points come when plotted to making a straight line, the higher the correlation between the two variables, or the stronger the relationship.

Scatter plot graphs A perfect positive correlation is given the value of 1 A perfect negative correlation is given the value of –1

Scatter plot Graphs If there is absolutely no correlation present then R 2 = 0 The closer R 2 is to 1 or -1, the stronger the correlation, or the stronger the relationship between the variables The closer R 2 is to 0, the weaker the correlation

Creating Graphs With Microsoft Excel

Step 1 Launch Excel Open a new Excel workbook Click on the New Workbook button.

Step 2 Enter the data to be graphed

Step 3 Highlight data to be graphed

Step 4 Select the Chart Wizard Click Here

Step 5 From the Chart Wizard box that opens select Chart type Click & Hold to view sample graph

Step 6 Click Next

Step 7 Add Title and Label Axes

Step 8 Click on As new sheet Click here to have your graph use the whole page

Finished Graph

Now make a Bar graph using the same data Click on sheet 1 Repeat steps 2-8 to complete a bar graph Print your graph to science cart laser Write your name on the graph and hand in to Mr. Girard

Making a Scatter plot line graph 1.Plot the following data 2.Create a scatter-plot graph 3.Click on chart 4.Click on add trendline 5.Click on linear 6.Click options 7.Check Display equation on chart 8.Check R-squared value on chart 9.Print graph and hand in to Mr. Girard

Regression Line The closer the R 2 Value is to 1.0 the better the fit to the data