1. Graphing Skills

18. Scatterplot vs Line Graph
Data points independent of each other
The next value does not depend on the previous

21. Labeling Axes The independent (manipulated) variable is the X axis
The dependent (responding variable) is written along the vertical axis
Units on any variables should be included in () following the axis title

24. Scaling Axes THIS IS THE MOST IMPORTANT!!!
Step 1: Find the range for the variables (biggest – smallest)
Step 2: divide the range by the # of intervals you want
You don’t want your data smooshed – spread it out!
Step 3: Use the rounded number to mark off intervals along the axis

25. Would this get credit?

26. Plotting Points
Step 1: Select the first pair of values from the data (X and Y – they are not always zero!!)
Step 2: Draw a light dashed line from the number on the X axis and over from the number on the Y axis
Step 3: where these dotted lines cross, put a dark point. Repeat for all points.

27. Best Fit or Curve Look for a pattern or trend
If so – draw a STRAIGHT LINE (do not connect the dots) that represents that trend
All points should lie near or on the line
For points not on the line – about ½ should fall above and ½ below
Your line should NOT extend beyond your range of data (extrapolation)

28. Correlation does not imply causation

29. Correlation does not imply causation