Scatter Plots and Trend Line

What is a line of best fit used for?

• To make predictions

• To make the graph look pretty

• To connect the points

Level 1: Determine the type of correlation.

• Positive

• Negative

• No Correlation

What type of correlation does this scatter plot have?

• positive 

• negative

• none

• all of the above

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 pages would be in a book with 6 chapters. 

• ≅100 pages

• ≅170 pages

• ≅60 pages

• ≅20 pages

You are analyzing a scatter plot that has a negative correlation. What is true of the of the x and y values?

• As x increases, y decreases

• As x increases, y increases

• As x decreases, y decreases

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

• A

• B

• C

• D

Which of the following would be the most accurate equation for the scatter plot?

• y = -2x - 7

• y = -x + 7

• y = 3x + 7

• y = 25x + 7

• Positive, strong
• Positive, weak
• Negative, strong
• Negative, weak

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

• A

• B

• C

• D

the slope is -5/7, what does that mean?

• gain 5 hour of sleep for 7 cups of coffee

• lose 5 hours of sleep for 7 cups of coffee

• lose 7 cups of coffee for 5 hours of sleep

• lose 5 cups of coffee for 7 hours of sleep