Copyright 2014 Edmentum - All rights reserved. Taco Burrito Total Chicken Beef Total

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1 Study Island Copyright 2014 Edmentum - All rights reserved. Generation Date: 04/03/2014 Generated By: Cheryl Shelton Title: Grade 8 Statistics and Probability 1. The owner of a food truck collected data on whether customers purchased tacos or a burrito and whether they chose chicken or beef for the meat. The two-way table below shows the data collected. Taco Burrito Total Chicken Beef Total Customers who purchase a burrito tend to choose chicken. Customers who purchase tacos tend to choose chicken. Customers who purchase a burrito tend to choose beef. None of the correlations listed are correct. 2. A group of men and women answered a survey asking about the type of weekend activities they enjoy. The two-way table below shows the data collected. Yard Work Shopping Watching TV Total Men Women Total

2 Women are less likely to enjoy watching television. Men are less likely to enjoy shopping. Women are more likely to enjoy yard work. Men are more likely to enjoy watching television. 3. Samantha asked a group of people whether or not they have a home computer and whether or not they have the Internet at home. The two-way table below shows the data collected. Computer No Computer Total Internet No Internet Total Those who do not have a computer are less likely to not have the Internet. None of the correlations listed are correct. Those who do not have a computer are more likely to have the Internet. Those who have a computer are less likely to not have the Internet. 4. Timothy asked a group of middle school students whether or not they have a bicycle and whether or not they have a skateboard. The two-way table below shows the data collected. Bicycle No Bicycle Total Skateboard No Skateboard Total

3 Those who have a skateboard tend not to have a bicycle. Those who do not have a skateboard tend not to have a bicycle. None of the correlations listed are correct. Those who do not have a skateboard tend to have a bicycle. 5. Which of the scatter plots below shows the most accurate line of best fit? W. X. Y. Z. W Z X Y

4 6. Which of the scatter plots below shows the most accurate line of best fit? W. X. Y. Z. W X Y Z 7.

5 Which of the following is true, based on the scatter plot above? The more times a person moves, the more they pay in rent. The larger the apartment, the less it costs to rent. There is no relationship between the size of the apartment and its monthly rent. The larger the apartment, the more it costs to rent. 8. Over the summer, the facility manager of a public swimming pool collected information on the amount of water in the pool and the number of swimmers. The results are shown in the scatter plot below.

6 Which statement is supported by the data in the scatter plot? As the number of swimmers increases, the amount of water in the pool tends to stay the same. As the number of swimmers increases, the amount of water in the pool tends to decrease. There is no relationship between the number of swimmers and the amount of water in the pool. As the number of swimmers increases, the amount of water in the pool tends to increase. 9. A marina collected data from a group of people regarding whether or not they have a boat and whether or not they have a jet ski. The two-way table below shows the data collected. Boat No Boat Total Jet Ski No Jet Ski Total None of the correlations listed are correct. Those who have a boat tend not to have a jet ski.

7 Those who have a boat tend to have a jet ski. Those who do not have a boat tend not to have a jet ski. 10. Coach Rawlings wants to determine if there is an association between the length of a student's arm and the distance the student can throw a discus. Which of the following can be interpreted from this data? There is both a positive and a negative association between the length of a student's arm and the distance the student can throw a discus. There is no association between the length of a student's arm and the distance the student can throw a discus. There is a negative association between the length of a student's arm and the distance the student can throw a discus. There is a positive association between the length of a student's arm and the distance the student can throw a discus. 11. At some companies, employees accrue vacation days based on the number of years they have been at the company. The graph below shows a line of best fit for data collected on the number of vacation days accrued by employees at different companies.

8 The equation for the line of best fit is shown below. Based on the line of best fit, if an employee works at a company for 6 years, how much vacation time will he or she accrue? 40 days 6 days 15 days 17 days 12. Which of the following best describes the relationship between the variables on the scatter plot below?

9 positive and negative association positive association negative association no association 13. The manager of a movie theater collected data from customers who bought tickets to a comedy or an action movie on whether or not they purchased popcorn at the theater. The twoway table below shows the data collected. Popcorn No Popcorn Total Comedy Action Total Customers who buy tickets to the comedy tend to buy popcorn. Customers who buy tickets to the action movie tend to buy popcorn. None of the correlations listed are correct. Customers who buy tickets to the comedy tend to not buy popcorn.

10 14. Celia is training for a race and recorded her average speed on each of 6 laps. Which of the following is true, based on the scatter plot above? There is both a positive and a negative association between Celia's lap number and her lap speed. There is a positive association between Celia's lap number and her lap speed. There is a negative association between Celia's lap number and her lap speed. There is no association between Celia's lap number and her lap speed. 15. The scatter plot and a line of best fit show the relationship for 10 people between weight gain and the number of doughnuts eaten.

11 Which statement describes the relationship between weight gain and the number of doughnuts eaten? A weight gain of more than five pounds was from less than four doughnuts eaten. There was an eight pound increase in weight for every five doughnuts eaten. There was a five pound increase in weight for every eight doughnuts eaten. The number of doughnuts eaten decreased with an increase of weight gain. 16. The graph below shows a line of best fit for data collected on the amount spent by customers at a carnival.

12 The equation of the line of best fit is y = 1.25x + 5. What does the y-intercept represent? the entrance fee to the carnival the cost per hour spent at the carnival the total amount of time spent at the carnival the cost to spend five hours at the carnival 17. A coffee shop collected data from its customers about which type of drink they prefer. The two-way table below shows the data collected. Black Coffee Cappuccino Mocha Total Men Women Total There is a strong preference for mochas among men.

13 There is little interest in black coffee among women. There is little interest in black coffee among men. There is a strong preference for mochas among women. 18. Which of the scatter plots below shows the most accurate line of best fit? W. X. Y. Z. Y W X Z

14 19. Students took a poll that asked whether or not they watch television in the evenings and whether or not they have homework on those same evenings. The two-way table below shows the results of the poll. Homework No Homework Total TV No TV Total None of the correlations listed are correct. Students who watch television in the evenings tend not to have any homework. Students who do not watch television in the evenings tend not to have any homework. Students who watch television in the evenings tend to have homework. 20. Which of the scatter plots below shows the most accurate line of best fit? W. X.

15 Y. Z. Z W Y X