Line of Best Fit Interpret

The height, h, (in cm) of a certain plant t days after it is planted can be best described by the linear model h = 1.20t + 1.14. What does the slope of this linear model represent in terms of the context?

• The height of the plant increases by 1.20cm each day.

• The height of the plant increases by 0.14cm each day.

• The height of the plant at the time of planting was 0.14cm.

• The height of the plant at the time of planting was 1.20cm.

The line of best fit for a scatter plot showing the age, x, and value, y, of a car is y = -1,580x + 17,020. What does the y-intercept represent?

• The age of the car is 2 years.

• The ending value of the car is $1,580.

• The beginning value of the car is $17,020.

• The amount of money owed to the bank for the car is $15,440.

• positive trend
• negative trend
• no trend

Is this line an accurate line estimate of best fit for the data?

• Yes

• No

• y = 1.45x + 22
• y = -2x + 15
• y = 1.33x + 30
• y = -1.5x + 24

The scatter plot below shows the number of books read by students in Mrs. Hall’s English class and their final grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade. 

• No relationship exists between the number of books students read and their English grades. 

The scatter plot below shows the number of books read by students in Mrs. Cates English class and their grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade.

• No relationship exists between the number of books students read and their English grades.

Is this line an accurate line estimate of best fit for the data?

• Yes

• No

The graph shows a line of best fit for data collected on the amount of time teenagers spend on the computer and watching television.  Based on the line of best fit, how much time does a teenager spend watching television if they spend 2 hours on the computer?

• 150 minutes

• 135 minutes

• 165 minutes

• 180 minutes

The red line represents the line of best fit for the scatter plot. How many ice cream sales are expected if the temperature is 90°?

• 55

• 0

• 103

• 100