Quiz 6: Scatter Plots And Trend Lines

Jeremiah conducts a survey and finds that as the first variable in his survey decreases, the second variable increases. What type of association is there between the two variables?

• Positive Association

• Negative Association

• No Association

• There is not enough information to tell.

Which is a true statement about the scatter plot shown at the left?

• The association is linear.

• The association is positive.

• The graph does not appear to have any outliers.

• All of the above are true.

Which is a true statement about this scatter plot?

• A) As the chapters in a book increase, the total number of pages decreases.

• B) As the chapters in a book decrease, the total number of pages decreases.

• C) As the chapters in a book increase, the total number of pages increases.

• Both B and C are true.

Which could likely be the variables represented in the scatter plot shown?

• The population of a city and the number of houses in the city.

• The population of a city and the number of letters in the city's name.

• The number of cars in a city and the pollution level of the city.

• The number of buildings in a city and the number of trees in the city.

Which is a reasonable prediction based on the scatter plot?

• if x = 3, y = 52

• If x = 4, then y = 95

• If x = 9, then y = 20

• All of the above

Which is the most reasonable value of x when y = 150?

• 15

• 21

• 9

• 11

Write the equation for the trend line in slope-intercept form. (y=mx+b)

Mathematical Equivalence

OFF

Match the following to the type of association it represents

• Positive Non-Linear

• 
• No Association

• 
• Negative

  Linear

• 
• Positive

  Linear

• 

Which has the strongest association? (Hint: There may be multiple answers)

• A

• B

• C

• D

Which scatter plot has an outlier?

• A

• B

• C

• D