1. 25 Algebra 1B – Notebook Entry _____ Name:__________________________
Line of Best Fit – Graded Assignment Date:___________________________
Directions: Please complete the following assignment in pencil. Show all necessary work and label answers as appropriate. 25
The following table shows the grams of fat and number of calories for a “regular” hamburger at various restaurants.
Chain
Fat (g)
(x)
Calories
(y)
McDonalds 9
250
Burger King 10
260
Hardee’s 15
310
Checkers 22
390
Sonic 38
710
Wendy’s 7
220
Part 1: On the coordinate plane provided, create a scatterplot of the data and draw a line of best fit for the data (7 points). Be sure to:
Title the Scatterplot (1 Point)
Label the axes (2 Points)
900
800
700
600
500
Label: ____________________________
400
300
Select two points ON YOUR LINE OF BEST FIT. Write them below and copy them onto the back of the paper (top).
____________
200
100 5 10 15 20 25 30 35 40
Label: ____________________ 10

2. Part 2:
State the two points you selected from the line of best fit: ________________________
(6 points) Write the equation for your line of best fit:
y =_______________________________________________
Part 3:
Use your line of best fit to answer the following:
(1 point) a. What is the relationship between the grams of fat and the calories in a hamburger?
(2 points) b. What is the slope of your equation, and what does it represent in this problem?
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
(2 points) c. What is the y-intercept of your equation, and what does it represent in this problem?
 _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
(2 points) d. If a Sheetz’s hamburger has 18 grams of fat, how many calories would you predict the hamburger will have?
(2 points) e. If a Friendly’s has a hamburger with 800 calories, how many grams of fat would you predict this item would have? 15