# Unit 5, Lesson 11 Mrs. King. Press the STAT button Choose 1: Edit…

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Unit 5, Lesson 11 Mrs. King

Press the STAT button Choose 1: Edit…

Enter the x values under L1 and the y values under L2

Press the 2 nd and Y= buttons

Turn the Plot “ON”

Press the ZOOM button Choose 9: ZoomStat

Assume that during a three-hour period spent outside, a person recorded the temperature and their water consumption. The experiment was conducted on 7 randomly selected days during the summer. The data is shown in the table below. Create a scatterplot for the data. What is the correlation?

 Line of Best Fit or a trend line is a straight line on a Scatter plot that comes closest to all of the points on the graph.  A Line of Best Fit may pass through some of the points, none of the points or all of the points.

Sandwich Total Fat (g) Total Calories Hamburger9260 Cheeseburger13320 Quarter Pounder21420 Quarter Pounder with Cheese30530 Big Mac31560 Arch Sandwich Special31550 Arch Special with Bacon34590 Crispy Chicken25500 Fish Fillet28560 Grilled Chicken20440 Grilled Chicken Light5300 Example: Is there a relationship between the fat grams and the total calories in fast food?

1. Enter the data in the calculator lists. 2. Prepare a scatter plot of the data.

The graph will look like this. 3. Have the calculator determine the line of best fit.  Press STAT → CALC #4 LinReg(ax+b)  Press ENTER y = 11.73x + 193.85

4. Enter this equation into Y= and press GRAPH to graph the line of best fit.

Suppose you are the diving officer on board a submarine conducting diving operations. As you conduct your operations you realize that you can relate the submarine’s changes in depth over time Use a graphing calculator to find the equation of the line of best fit for the data.

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