Positive, Negative, No Association and Predictions

What is the type of association (correlation)?

• Negative 

• no association

• positive 

The red line represents the line of best fit for the scatter plot. How many ice cream sales are expected if the temperature is 90°?

• 55

• 0

• 103

• 100

What type of association does this scatter plot represent?

• positive linear association

• negative linear association

• no association

• nonlinear association

If a scatterplot has no correlation then...

• ...it has no ordered pairs

• ...it has ordered pairs that have a negative pattern

• ...its ordered pairs have no predictable pattern

• ...if it makes a lion on a graph (roar!)

What is the correlation?

• Negative correlation

• No correlation

• Positive correlation

• All of the above

Estimate the y-intercept of the trend line by looking at the graph.

• 2

• 1.8

• 1.2

• 0

What type of association does this graph have?

• positive

• negative

• none

• all of the above

A small theme park is trying to determine the number of guests they should expect on a weekend, based on the temperature outside.  Based on the trend line, about how many guests should be expected if the temperature is around 80°?

• 8,300

• 8

• 7,300

• 9,300

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

Which line appears to fit the data better?

• line A

• line B