Project Maths Development Team © 2008

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Project Maths Development Team © 2008 Correlation Coefficient Project Maths Monday, April 08, 2019 Total Fat (g) Total Calories Hamburger 9 260 Cheeseburger 13 320 Quarter Pounder 21 420 Quarter Pounder with Cheese 30 530 Big Mac 31 560 Special 550 Special with Bacon 34 590 Crispy Chicken 25 500 Fish Fillet 28 Grilled Chicken 20 440 Grilled Chicken Light 5 300 Before doing this on the calculator, the class should do a scatter graph using the data in the table. Discuss the relationship between the data (i.e. gms of fat v calories). Project Maths Development Team © 2008 projectmaths.ie

Project Maths Development Team © 2008 Correlation Coefficient by Calculator Using the Casio fx-83ES This will show the table on the right on the screen. Now input all the data items into the X and Y columns. Press after each data item. When all the data items are inputted, press the following: This will give a correlatrion coefficient of 0.9746 Compare this answer with your interpretation of the scatter graph. Project Maths Development Team © 2008

Project Maths Development Team © 2008 Line of Best Fit by Calculator Monday, April 08, 2019 Using the Casio fx-83ES The data is already inputted to the calculator using the previous steps. If the correlation coefficient is still on your calculator, scroll up to it using the button and delete it using the button. Then for the value of A And for the value of B (NB Delete the value of A before calculating the value of B) Line of Best Fit is y = A + Bx Project Maths Development Team © 2008 projectmaths.ie