Topic 4 Bi-variate Data Post-Assessment

Master bivariate data with this post-assessment! Analyze scatter plots, trends, and tables.

1. Which of the scatter plots show NO trend? 2. The scatter plot below shows the population of a village (p) over time (t). Describe the relationship between the population of the village and time. the population is decreasing over time the population remains roughly the same over time the population is increasing over time none of these 3. The scatter plot shows the study times and test scores for a number of students. Is there a relationship between study time and scores? No, the points are far from a trend line Yes, the points are close to a trend line. The relationship is linear, positive and strong Yes, the points are close to a trend line. The relationship is linear, negative and strong Yes, the points are close to a trend line. The relationship is nonlinear, positive but weak. 4. Which table matches the scatter plot from number 3? 5. You ask middle school and high school students how many TV sets are in their homes. Complete the two-way frequency table to show the results of the survey. Number of TV Sets Middle School Students High School Students Total zero 0 1 1 one 6 8 14 two 12 9 21 three 9 4 13 four 5 3 8 TOTAL 32 25 57 6. According to the data in the two-way frequency table below, which statement is true? More teachers work 26-30 years than 19-25 years There were a total of 35 teachers surveyed More police officers work 26-30 years than 19-25 The most common number of years served by all those surveyed was 19-25 years 7. The scatter plot shows the number of CDs that Disc-O CD factory produced in different months. What is the best prediction for the month in which they will produce 5,500 CDs? November September July May 8. Draw a trend line on your paper. Is your trend weak, strong, or none? 9. What type of association does this graph show? positive negative no association 10. Does this graph show a linear or non-linear association? linear non-linear 11. Is there an outlier? yes no 12. What relationship is there between the data points? Hint, compare x and y axis' As number of hours studied decreases test scores decrease 13. The scatter plot shows Leanna's elevation above sea level during a hike. The trend line passes through the points (30,1070) and (75,1680). If Leanna starts at 663 feet above sea level and maintains the same rate, answer the following questions. What is her y-intercept elevation? 663What is her rate of change 122 your answers and write them in slope intercept form. y=122 A beverage company surveyed 200 people to find out whether they prefer plain water or flavored water. This table shows the RELATIVE FREQUENCIES from the survey. 14. Based on the data in the table, which statement is true? people under 40 years old are less likely to prefer flavored water than people 40 years old or over people under 40 years old are as likely to prefer flavored water as people 40 years old or over people under 40 years old are more likely to prefer flavored water than people 40 years old or over Beckham asked 50 students in her school whether they do volunteer work. This table shows the results in RELATIVE FREQUENCY. 15. How many 8th graders DO volunteer work? 30 0.30 15 8 16. How many more 7th graders were surveyed than 8th graders? 4 0.54 0.46 5 17. How many more 8th graders volunteer than don't volunteer? (you already found out how many DO volunteer in question 15, so now find how many don't and find the difference). 15 7 0.16 0.14