Review Scatter Plots/Fitted Lines

Which sentence describes the relationship shown on this scatter plot?

• As the temperature decreases, the visitors increase. 
• As the temperature increases, the number of visitors increases. 
• As the visitors increase, the temperature decreases. 
• No correlation

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

• Yes

• No

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

• Yes

• No

Find the slope for the trend line using points (2,2) and (4,3)

• 2
• 1/2
• -2
• -1/2

As the age of the car increases, its value decreases. Which scatterplot represents this relationship?

• A
• B
• C
• D

Students in a group of chess teams submitted data about hours of team practice and the number of matches the team won.  The graph shows the results of the data.  Based on the linear regressions equation y = 3.14x + 3.52, if a team practices 4.5 hours per week next year, which is the best prediction of the number of chess matches a team could expect to win?  

• about 24
• about 12
• about 8
• about 18

Based on the trend line, about how many guests should be expected if the temperature is around 80 degrees?

• 8,300
• 7,300
• 8
• 9,300

Predict the grade of a student that has 7 absences.

• 50
• 45
• 70
• 60

What is the best prediction for the number of candies in the jar when 30 students visit her?

• 90
• 180
• 135
• 150

Write the equation of the trend line.

• y = 1x
• y = 1x + 100
• y = 20x
• y = 20x + 100