Using Linear Models to Make Predictions

The scatter plot shows the number of people in 8 different households and the average amount of money each household spent on groceries.

Based on the scatter plot, what is the best prediction of the average amount of money spent on groceries of a household of people?

• $240

• $190

• $210

• $300

The scatter plot shows the time spent studying compared to test scores for Mr. Stone’s eighth-grade class. Predict the score that a student would earn if she studied for 7 hours. Round your answer to the nearest whole number.

• 75

• 79

• 80

• 85

The equation below represents an elevator's height after an amount of seconds. Using this equation, what should the height of the elevator be after 14 seconds? H represents the height, and s represents seconds.
h = -3.8s + 290

• 80

• 236.8

• -80

• 72.6

y=125 + 80x models the amount of money (y) in the register after selling x tickets. How much money does she have in the register before selling any tickets?

• $125

• $80

• $205

• $45

Which statement below accurately represents the graph?

• $100 is earned for each hour worked

• $100 is earned for every 2 hours worked

• $500 is earned for every 8 hours worked

• $200 is earned for every 3 hours worked

Which statement best describes the information in the graph?

• Taylor can write 6 words per minute

• Taylor can write 25 words per minute

• Taylor can write 50 words per minute

• Taylor can write 150 words per minute

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• D

There are two coordinate points that are directly on the line in this graph. What are they? What can we find with these two data points.

• (6, 60) and (8, 85)

• The slope

• (1, 30) and (9, 190)

• The y-intercept

The two coordinate points on the line in this graph are (1, 30) and (9, 190). The initial value is 25. Write an equation in slope intercept formula (y=mx+b) that represents the line of the graph.

Mathematical Equivalence

ON

The scatter plot shows the volume of a tank of water over time. The equation for the line given is y=20x+25 where x represents the time in minutes and y represents the volume in gallons. What could you predict the volume to be at 15 minutes?

• 400 Gallons

• 375 Gallons

• 350 Gallons

• 325 Gallons

• 300 Gallons