2. Bell Work1/21/15 Simplify the following fractions.

3. Yesterday’s Homework 1.Any questions? 2.Please pass your homework to the front. Make sure the correct heading is on your paper. Is your NAME on your paper? Make sure the homework is 100% complete. Incomplete work will NOT be accepted.

4. Scatter Plots and Trend Lines 9/17/2015 Heading TSWBAT: interpret and analyze scatter plots. Represent two numerical variables on a scatter plot and informally describe how the data points are distributed and any apparent relationship that exists between the two variables (e.g., between time spent on homework and grade level).

5. Notes Scatter Plot = a graph of points representing a collection of data. Correlation = describes a relationship between two data sets. Definitions Extrapolation = a prediction outside the range of our data. Interpolation = a prediction within the range of our data.

6. Notes a. Positive Correlation The graph has a pattern of __________ slope. As variable x ____________, variable y ___________. upward increases

7. Notes b. Negative Correlation The graph has a pattern of ____________ slope. As variable x ____________, variable y ___________. downward increases decreases

8. Notes c. No Correlation The graph has a pattern of _____ _____________. As variable x ____________, variable y _____________________. no correlation increases can not be predicted

9. Notes Look at the points (dots) on the graph, is there a correlation (pattern/trend)? correlation As hours spent online ____________, number of emails sent __________. Ex1. The graph has a pattern of __________ slope. As variable x ____________, variable y ___________. upward increases Positive Correlation

10. Notes As the temperature outside ____________, the hours spent studying ___________. Ex2. The graph has a pattern of ____________ slope. As variable x ____________, variable y ___________. downward increases decreases increases decreases Negative Correlation Look at the points (dots) on the graph, is there a correlation (pattern/trend)?correlation

11. Notes As the age of someone ____________, the number of books read last year ____________________. Ex3. The graph has a pattern of ____ ____________. As variable x ____________, variable y ____________________. no increases can not be predicted increases can not be predicted. No Correlation Look at the points (dots) on the graph, is there a correlation (pattern/trend)?correlation

12. Summary If a scatter plot has an upward slope it has a _______ correlation. If it is downward it has a negative __________. If it is not upward or downward it has ___ correlation. positive correlationno

13. Today’s Homework 1.Pencil ONLY. 2.Must show all of your work. NO WORK = NO CREDIT 3.Must attempt EVERY problem. 4.Always check your answers. Rules for Homework

14. Homework4.4 Describe the correlation. 1.2.3. 4.5.

15. Complete the Ticket Out the Door without talking!!!!! Talking = time after the bell! Ticket Out the Door Put your NAME on the paper. When finished, turn your paper face DOWN. Describe the correlation.