Scatter Plot and Best Fit Line
Create a Scatter Plot and conduct a Two Variable Regression Analysis for a given data set. Explore how outliers affect the best fit line.
Explore the completed construction
Drag the points and explore how outliers affect the best fit line of a data set.
Watch the tutorial video
Create the construction yourself
|1.||||In the Spreadsheet View, enter the following data values into the cells of column A: A1: 1 A2: 5 A3: 2 A4: 8 A5: -2|
|Hint: Always evaluate your input by hitting the Enter key.|
|2.||||Enter the following numbers into the spreadsheet cells of column B: B1: -1 B2: 2 B3: 3 B4: 4 B5: 1|
|3.||||Create a Scatter Plot from this data: Highlight all cells of columns A and B that contain data. Then, select the tool List of Points from the Spreadsheet View Toolbar and click Create in order to create points from your data set.|
|Note: The values in column A determine the x-coordinates and the values in column B specify the y-coordinates of the plotted points.|
|||||Hint: You might want to use tool Move Graphics View if not all five points are visible in the Graphics View.|
|4.||||Select the Best Fit Line tool from the Graphics View Toolbar. Create the line that best fits your data points by using a selection rectangle that contains all data points plotted.|
|Hint: Create a selection rectangle by clicking in the upper left corner of the Graphics View and steadily sliding your mouse to the lower right corner of the Graphics View. Make sure that all data points lie within the selection rectangle.|
|5.||||Exploration: Using this construction you can easily demonstrate how outliers affect the best fit line of a data set. Select the Move tool and drag one of the points in order to create an outlier.|
|Hint: You can also change the initial data directly in the Spreadsheet View.|