8th Grade 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

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

Which scatter plot shows a linear relationship between x and y?

• Graph A
• Graph B
• Graph C
• Graph D

Find the slope of the line.

• Undefined
• 0
• 1
• -1