Lesson 9-1 Scatter Plots Obj: The student will be able to create and interpret scatter plots HWK: p 388 2-5 all Vocab: 1) scatter plot 2) correlation 3) positive correlation 4) negative correlation 5) no correlation 6) line of best fit

Tell if positive, negative or no correlation. Explain Ex 1) The amount of time spent playing video games and the amount of time spent studying Ex 2) The number of pets in the neighborhood and the grades you have in school Ex 3) The temperature outside and the number of people going to the beach

There are strong and weak correlations

Ex 4) The table shows the winning times for the Olympic women’s 3000 meter speed skating race. Use the given data to make a scatter plot and describe the correlation. Years since 1976 4 8 12 16 18 22 26 30 Winning time (min) 4.54 4.41 4.20 4.33 4.29 4.12 3.96 4.04

Ex 5) Make a scatter plot of the data and draw a line of best fit Ex 5) Make a scatter plot of the data and draw a line of best fit. Then use the data to predict the exam grade of a student who studies 4 hours per week. Hours studied 5 9 3 12 1 2 6 7 Exam grade 80 95 75 98 70 82 88