I have determined that I only require a worksheet for the concept that I am going to be presenting.  The worksheet is given below.

We have all seen scatter plots.  They are basically just collections of points on the coordinate plane.  But how do we graph them on the calculator?

Example 1: The following information shows the amount of time spent exercising each week and the resting heart rates in beats per minute of members of an aerobics class.

4 h, 60 bpm        3 h, 63 bpm        3.5 h, 67 bpm      4 h, 55 bpm
2 h, 70 bpm        2.5 h, 65 bpm      3 h, 60 bpm        5 h, 50 bpm
4.5 h, 60 bpm      5 h, 65 bpm        4.5 h, 50 bpm      3 h, 70 bpm
5 h, 55 bpm        1 h, 75 bpm        3 h, 55 bpm        4 h, 57 bpm

This information can be collected into a set of ordered pairs, where the first value will be time in hours, and the second value will be beats per minute.  Collect the above data into a set of ordered pairs.

(4, 60),


Now we want to enter this information into our calculators.  We will enter the values for time in L1, and bpm in L2.  Make sure that you enter the values in the same order for both lists (that is, make sure that the points “stay together.”
Now press 2nd then STAT PLOT to graph this information.  Go to 1:Plot1… and press ENTER.  Turn this plot On and select the scatter plot under Type:.  Your 1:Plot1…Xlist: should be L1 and Ylist: should be L2 (or whatever lists you may have used). You can also choose which mark will appear on your graph.  Next, press ZOOM and find 9:ZoomStat.  You now have your scatter plot shown, without having to worry about setting up a window.  NOTE: You may not get the graph you want if you have an equation listed under Y=, so make sure all of those graphs are turned off.



Predict what the heart rate is for someone who exercises for 2 hours would be. 

Example 2: The following table represents the average time studying per week in hours with the final grade earned in a math class.  Create a scatter plot and put in a line of best fit, then answer the questions.
(6, 80), (1, 65), (5, 85), (2, 60), (5, 70), (3, 70), (9, 95), (8, 90), (3, 80),
(7, 70), (4, 65), (8, 75), (4, 80), (7, 85), (9, 85), (10, 95), (1, 75)
    a.  What correlation exists?

    b.  What is the correlation value (r)?

    c.  If you spent 5 hours a week studying, what grade would you expect?

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