1. Write down this problem on your COMMUNICATOR Predict y when x is 12. Predict w/table. Predict w/graph. Which is more accurate? Why? xy 24 36 47 Page XX of your INB (12,16) (12, 24)

2. ITEMS of BUSINESS Last day to retake Ch 11 test is Thursday April 30. Must have practice test & rework done to retake. Ch 16 test will be on Tues/Wed May 4/5. SAGE Test will be on May 14/15 & 18/19. BE HERE.

3. Questions on Homework?

4. Have your homework out on your desk.

5. Try this CHALLENGE question: Which is a better line of fit? Why? The second line is closer to all points, not just a few.

6. BIVARIATE DATA 16.3 Spaghetti Lab Per Capita Income % of people with a college degree

7. predict how many marbles it takes to break XX pieces of spaghetti noodles. My prediction is: ______ How many it really took: _____ Get into your Groups Pages XX of your INB

8. 1. Make a prediction using the table. $250 means about _____ phone calls Follow along. 2 ½ (15) = 37.5 phone calls ≈38 SPAGHETTI LAB WARM UP

9. Just use interwrite to complete the graph with the students. Use increments of 2 for phone calls (x-axis) & increments of 24 for money collected (y-axis) Complete the graph. Follow along. SPAGHETTI LAB WARM UP 1.

10. SPAGHETTI LAB WARM UP Follow along. 1. SLOPE: __________ Y-INTERCEPT: __________ Line of Best Fit: __________ 25 35 y=25/4x+35 4

11. SPAGHETTI LAB WARM UP Follow along. 2. Prediction using table: _____ Prediction using LoB: _________ How close are they? _________ ≈38 calls 34.4 calls y=25/4x+35 250=25/4x+35 -35 off by 3.5 -35 215 =25/4x ÷ 25/4 34.4 = x Why is the table off by 3.5 compared to the equation? B/c the table has non- linear points. Talk about how table predictions are “ok”, but if you were collecting thousands of dollars per day, you would want to be able to make a pretty accurate prediction about phone calls. Being off by 3.5 would compound to being off by hundreds of phone calls! That’s not good enough. Linear equations give most accurate predictions!

12. SPAGHETTI LAB

13. Day 1 – Integer operations, PEMDAS, evaluating 16.3 Spaghetti Lab predict how many marbles it takes to break XX pieces of spaghetti noodles. My prediction is: ______ How many it really took: _____ How close were you? ______

14. SHOW YOUR WORK Worksheet 16.3 Spaghetti Lab