Lesson 3-5 Scatter Plots and Trend Lines

Obj: The student will be able to 1) Create and interpret scatter plots 2) Use trend lines to make predictionsHWK: p 200 1-13 all p 205 1-2 all (try this)Vocab: 1) scatter plot

2) correlation 3) positive correlation 4) negative correlation

5) no correlation 6) trend line

Ex 1) The table shows the number of species added to the list of endangered and threatened species in the United States during

the given years. Graph a scatter plot using the given data. Increase in List

Calendar Year 1996 1997 1998 1999 2000 2001 2002

Species 91 79 62 11 39 10 9

Ex 2) Describe the correlation illustrated by the data in Example 1. Explain

Identify the correlation you would expect to see between each pair of data. Explain

Ex 3) the number of pets a person owns and the number of books that person read last year

Ex 4) the number of empty seats in a classroom and the number of students seated in the class

Ex 5) the temperature outside and the number of people at the beach

Ex 6) Choose the scatter plot that best represents the relationship between the number of days since a sunflower seed was planted

and the height of the plant. Explain

Ex 7) The scatter plot shows a relationship between the total amount of money collected and the total number of rolls of wrapping paper sold as a school fund-

raiser. Based on this relationship, predict how much money will be collected when 175 rolls have been sold.