Bivariate Data Unit Review

True/False: The data in a scatter plot will alway be in a perfectly straight line.

• True

• False

True/False: A scatter plot has a line of best fit to show an approximation of future data points, not a perfect prediction.

• True

• False

A teacher made the following graph showing absences vs. final grades.  Predict the grade of a student that has 7 absences.

• 45
• 50
• 60
• 70

The graph shows a line of best fit for data collected on the amount of income earned by lawn companies in relation to the number of yards mowed.  What is the equation of the line of best fit?

• y = (3/2) x
• y = 30x
• y = 30x + 300
• y = (3/2)x + 300

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

What type of correlation does this graph have?

• Negative

• no association

• positive

What type of correlation does this graph have?

• positive

• negative

• none

• all of the above

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

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books.  Use the trend line to predict how many chapters would be in a book with 180 pages. 

• 12 chapters
• 15 chapters
• 18 chapters
• 21 chapters

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

• 2
• 1/2
• -2
• -1/2