Creating Scatterplots

Scatter Plots Click on “Home” or “On”. This gives you an opportunity toward the bottom of the page to “add a page to:” You want to choose the spreadsheet (the fourth one over). Cursor over to that and push enter. You will need to type a title in columns A and B (x and y if there is nothing else). Enter your domain in column A. Enter your range in column B.

Click on Home (On) Choose Data and Statistics (The one at the bottom that looks like a bar graph) Down where the x axis should be is a very light text box with “ Click to add variable ”. Move cursor over that and click. Choose “ time ” (or whatever you named the domain). On the left where the y axis should be is a very light text box again. Move the cursor over that and choose “ distance ” (or whatever you named the range).

Creating a Trend Line (Linear Regression) Click on Menu > (4) Analyze > (6) Regression > (1) Show linear (mx + b) The trend line (or linear regression) should appear. To Trace along that line: Menu > (4) Analyze > (A) Graph Trace Using the left and right arrows you can move along that line. Using the up and down arrows, you can move between the dots on the scatter plot and the linear regression. CLICK ON THE X IN THE UPPER RIGHT CORNER AND TAB TO “NO” THEN PRESS ENTER TO DELETE GRAPH, ETC.

Number 27 Time (Min) Distance (Mi) Juan and his parents are visiting a university 205 miles from their home. As they travel, Juan uses the car odometer and his watch to keep track of the distance. a.Make a scatter plot b.Describe the correlation c.Draw a trend line and predict the distance Juan would have traveled going to a university 4 hours away.