4.11 Extra Credit: Linear Regression

The table below shows the number of grams of carbohydrates, x, and the number of Calories, y, of six different foods. Which equation best represents the line of best fit for this set of data?

Emma recently purchased a new car. She decided to keep track of how many gallons of gas she used on five of her business trips. Which equation best represents the line of best fit for this set of data?

The accompanying table shows the enrollment of a preschool from 1980 through 2000. Which of the following is a linear model for the data?

• Omar began with 99.2 cm of rope.

• The length of the rope decreases by 8.5 cm after each knot he ties.

• The length of the rope increases by 8.5 cm after each knot he ties.

• There are -8.5 knots.

• 79

• 81

• 85

• 92

• 83 new cases

• 99 new cases

• 103 new cases

• 125 new cases

• 2 ^oC

• 12 ^oC

• -12 ^oC

• -5 ^oC

The graph below shows a line of best fit for data collected on the number of medium pizzas sold at local pizza shops and the amount of money earned in sales. Based on the line of best fit, how many pizzas were sold if $260.00 was earned in sales?

• 120 pizzas

• 150 pizzas

• 80 pizzas

• 40 pizzas

A researcher made the following graph showing the number of hours per day that people spend on the computer versus the number of pounds that they are overweight. Predict the number of pounds overweight someone would be if they spent 8 hours per day using a computer.

• 50

• 45

• 60

• 30

The graph below shows a line of best fit for data collected on the age of a car and the overall mileage of the car. Based on the line of best fit, what is the mileage of a 9-year-old car?

• 67,500 miles

• 180,000 miles

• 135,000 miles

• 90,000 miles