Linear Models and Scatter Plots

Which relationship is shown by this scatter plot?

• As the cost goes down, the number sold goes

  down.

• As the cost goes up, the number sold goes

  down.

• As the cost does down, the number sold

  remains the same.

• There is no relationship between cost and the

  number sold.

Which graph represents a positive correlation?

• 
• 
• 
• 

Consider the scatter plot graphs. Look at each trend line. Which graph does a better job capturing the trend of the data?

• Graph A

• Graph B

• Neither Graph

The scatter plot shows the weight of a bag of pretzels based on how many pretzels are in the bag. Consider the trend line. Which of these statements are TRUE?

• the trend line indicates a negative association

• the trend line indicates a positive association

• If a bag contains 40 pretzels, the weight will be about 2.5 ounces

• the trend line is a "good fit" for this scatter plot

• there is no association between the number of pretzels and the weight of the bag

The scatter plot represents the amount of dog food recommended based on the weight of the dog. Which BEST describes the type of association shown in this scatter plot?

• no association

• nonlinear association

• positive association

• negative association

What is a scatter plot?

• A graph that shows the relationship of two data sets.

• A graph drawn using rectangular bars to show how large each value is.

• A graph that shows information that is connected in some way.

• A graph that shows data changing over time.

Based on the graph, if Joe earned $400, how many hours did he work?

• 25 hours

• 35 hours

• 45 hours

• 15 hours

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

• A

• B

• C

• D

The linear regression equation that models hours in the mall vs. amount of money spent is y = 50.26x + 15.14. What does the slope mean in context of the problem?

• The amount of money you spent increases $50.26 each hour.

• The amount of money you spend increases $15.14 each hour.

• If you spent 0 hours at the mall you spend $50.26.

• If you spent 0 hours at the mall you spend $15.14.

What kind of correlation?

• Positive

• Negative

• No