1. STANDARD: 8.SP.1 STATISTICS AND PROBABILITY: SCATTER PLOTS

2. SCATTER PLOTS Review: A variable is a trait or quantity whose value can change or vary. A coordinate plane using the horizontal x axis and the vertical y axis Generate points on a coordinate plane by graphing an x value, then y value on the coordinate plane.

3. SCATTER PLOTS One variable data: a data set that contains measures of only one trait or quantity Two variable data : data that contains measures of ________ traits to try to find a relationship. Scatter plot : a graph that displays the ____________ data in a graphic form.

4. SCATTER PLOTS Once a scatterplot has been graphed, the information on the graph can then be interpreted. Illustration of scatter plots with various properties: (a) 'shotgun' scatter, with low association, (b) strong positive association, (c) strong negative association, (d) and (e) low association, with very little change in one variable compared with the other,

5. SCATTER PLOTS Some graphs have linear associations, and some have non linear associations. Which is which? Why?

6. SCATTER PLOT Some graphs have points that seem not to belong to the graph. They do not offer a positive, negative, linear or non linear association. They are called OUTLIERS.

7. SCATTER PLOTS Some two variable graphs bunch up together…this is called a cluster.

8. SCATTER PLOTS What do you notice?

9. SCATTER PLOTS What do you notice?

10. SCATTER PLOTS

11. http://www.youtube.com/watch?v=8vhE8ScWe7w http://www.youtube.com/watch?v=WmcU6gxRSWI http://www.youtube.com/watch?v=oYkBMeFzNKA

12. SCATTER PLOTS Student12345678910 Math 64508534562472634293 Science 68708333602774634096 Example 1: Data for 10 students’ Math and Science scores are provided in the chart. Describe the association between the Math and Science scores.

13. SCATTER PLOTS Example 2: Data for 10 students’ Math scores and the distance they live from school are provided in the table below. Describe the association between the Math scores and the distance they live from school. Student12345678910 Math 64508534562472634293 Distance from School (miles) 0.51.812.33.40.22.51.60.82.5

14. SCATTER PLOTS Number of Staff345678 Average time to fill order (seconds) 562472634293 Example 3: Data from a local fast food restaurant is provided showing the number of staff members and the average time for filling an order are provided in the table below. Describe the association between the number of staff and the average time for filling an order.

15. SCATTER PLOT Date19701975198019851990199520002005 Life Expectancy (in years) 70.872.673.774.775.475.876.877.4 Example 4: The chart below lists the life expectancy in years for people in the United States every five years from 1970 to 2005. What would you expect the life expectancy of a person in the United States to be in 2010, 2015, and 2020 based upon this data? Explain how you determined your values.

16. SCATTER PLOT Today, in a group of 2-3, 1) choose two variables to investigate and see if they have a relationship 2) Find at least 10 examples 3) organize your data into a table, 4) GRAPH the data, and 5) answer the following questions A) What two variables are you measuring and comparing? B) What is the data you recorded (as a table) C) What does the data look like after graphing it? D) What does the data tell you? Are there any patterns/associations/clustering/or outliers? Ask one question to a random student in class.