We could investigate this by collecting data on how long students studied and perhaps their grade on a final exam and then creating a scatterplot. The overall pattern would help us determine what kind of association time spent studying has with final exam grades. On the TI83 or 84 series of graphing calculators, getting a scatterplot is pretty easy. The table below shows the heights inches and weights pounds of seven randomly selected players on the Chicago Cubs active roster.
We will use the height as the independent variable the predictor and the weight as the dependent variable the response. Often a textbook will tell you which to treat as x predictor and y response.
If not, be sure to check out the article on reading scatterplots to better understand how to choose these variables. Now enter the values for x the predictor into L1 and the values for y the response into L2. Just type the number and press enter to go to the next space. Press the right arrow to go over to L2. If you want to see which points are which, you can press [TRACE] and use the arrows to jump from point to point.
Believe it or not, the most common cause of this is having your calculator in your backpack and having it accidentally type all kinds of stuff in the y-list. I see it every semester! Please follow the example below to plot the coordinates -4, 4 and 4, 4 using the Graph App. News Center Contact TI.
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