Quiz on Scatterplots and Equations

Elena is studying the relationship between foot lengths and forearm lengths for a group of people. The trend line for the data is shown. Based on the scatterplot, what is the best prediction of a person’s foot length in inches if the length of their forearm is 13 inches?

• Approx. 12 in.

• Approx. 12.5 in.

• Approx. 13 in.

• Approx. 13.5 in.

Maylin is training for a marathon. She decides to track her time per mile, in minutes, for 8 weeks. Which equation best fits the data?

• y = 0.18x + 10.06

• y = -0.18x + 10.06

• y = 2x + 8.6

• y = -2x + 8.6

April tracked the value of her smartphone over several years. The table shows how the value decreased over time. Which scatterplot shows the data and an appropriate trend line for the data?

• a

• b

• c

• d

Eric works in a restaurant. Sometimes he clears tables. The scatterplot shows how much he earned in tips by clearing tables on different days. Which statement would be the best prediction of how much Eric will earn by clearing tables?

• Eric will earn about $10 for clearing 6 tables.

• Eric will earn about $6 for clearing 6 tables.

• Eric will earn about $12 for clearing 11 tables.

• Eric will earn about $16 for clearing 13 tables.

Andrea and Xavior bought a house. They keep track of their house’s value over the years. Which equation best represents the trend line for the data and can be used to make predictions?

• y = 75x + 200

• y = -75x + 200

• y = 75x - 200

• y = -75x - 200

Consider the scatterplot showing the number of customers at a shopping center and a nearby coffee shop. For the scatterplot, determine if the relationship shown is ​ (a)   . If the relationship is linear, state whether the relationship is ​ (b)   .

• Linear

• Non-Linear

• Neither

• positive

• negative

• neither

Consider the scatterplot shown. Predict the exam score if 7 hours of TV is watched.

Mathematical Equivalence

ON

Zahara and Kevin are studying weather patterns in New York. They have a graph showing several months of weather data. Predict the temperature when there are about 19 hours of daylight.

The graph shows the average number of minutes spent playing video games versus hours spent sleeping. Use two points on the trend line to determine its slope. Write your answer as a decimal.

Mathematical Equivalence

ON

Which graph best shows a positive correlation between the number of hours studied and the test scores?

• 
• 
• 
• 

Tags

CCSS.8.SP.A.1

CCSS.8.SP.A.2