unit 11 assessment - scatter plots and data

1. Which is a true statement about two numerical sets of data that have negative association?

• A. As one variable increases, the other variable does not change.

• B. As one variable increases, the other variable increases.

• C. As one variable decreases, the other variable decreases.

• D. As one variable increases, the other variable decreases.

2. What type of association would you expect to see between the amount of fog in the sky and the distance that a pilot can see?

• A. Positive association

• B. Negative association

• C. No association

• D. There is not enough information to tell.

3. Which variables would the scatter plot at the right be most likely to represent?

• A. The number of siblings a person has and the person’s GPA

• B. The number of guests at a hotel and the total water consumption

• C. The total number of miles driven and the total gallons of gas used

• D. The number of people at a concert and the total concession sales

4. Which scatter plot shows both positive and linear association?

• 
• 
• 
• 

5. Which of the scatter plots below shows a stronger association, and why?

• A. Scatter plot A; its slope is greater than B.

• B. Scatter plot A; its points of data are closer together than B.

• C. Scatter plot B; its slope is positive.

• D. Scatter plot B; it does not have any data points that are outliers.

6. Which equation written in slope-intercept form represents the trend line shown on the scatter plot below?

• 
• 
• 
• 

7. John and Bob each made a scatter plot to represent the data in the table as shown below. Who made the scatter plot correctly?

• A. John only

• B. Bob only

• C. Both John and Bob

• D. Neither John nor Bob

8. Which of the following is a conclusion that you can make based on the table ?

• A. As the average temperature increases, the snow cone sales increase.

• B. As the average temperature increases, the snow cone sales decrease.

• C. As the average temperature decreases, the snow cone sales increase.

• D. There is no association between the temperature and the number of snow cone sales.

9. Are there any outliers in the data ?

• A. Yes; Week 10 is an outlier since it is the greatest data point.

• B. Yes; Week 1 is an outlier since it is the lowest data point.

• C. Yes; Week 7 is an outlier since it does not fit the general trend of the data.

• D. No; there are not any outliers in the data.

A scatter plot was made to show the number of homes in a town based on the year. A trend line was drawn on the graph with an equation of y = 84x + 625 where x is the number of years since 1995 and y is the total number of homes in the town.

Predict the number of homes in the town in 2015.