1. Academy Algebra II 4.2: Building Linear Functions From Data HW: p.290-291(3-8 all,18 – by hand,20 – calc) Bring your graphing calculator to class on Monday Unit 2 Test: Wednesday (3.1,3.2,2.2,2.3,2.5,4.2)

2. 1. 2. 3. 4. 4.2: Do Now: Determine whether the relationship between the two variables is linear or nonlinear.

3. Sketch a scatter plot by hand. Draw and find the equation of the line of best fit. Relative Humidity (%) 0102030405060708090100 Apparent Temperature (F) 6465676870717273747576

4. Scatter plot & LOBF by hand. Relative Humidity Apparent Temperature

5. Sketch a scatter plot using TI-89. Relative Humidity (%) 0102030405060708090100 Apparent Temperature 6465676870717273747576 Press APPS, select Data/Matrix Editor. 3: New. Type: Data, Folder: Main. Variable (make up a name). ENTER, ENTER. Enter data in c1 and c2. Press F2 for Plot Setup. F1 for Define. Plot type: Scatter, Mark: Box, x = type c1 in this box ALPHA ) 1, y = c2. ENTER, ENTER.

6. Sketch a scatter plot using TI-89. Relative Humidity (%) 0102030405060708090100 Apparent Temperature 6465676870717273747576 Display the Y= by pressing F1. Clear any existing equations in y1, y2, etc. Adjust window and view graph of scatter plot. -or- press F2, select 9: ZoomData

7. Sketch a scatter plot using TI-89. Relative Humidity (%) 0102030405060708090100 Apparent Temperature 6465676870717273747576 Press APPS, select Data/Matrix Editor. 1: Current. Press F5 for Calc menu. Calculation type: LinReg. x = c1, y = c2. Store RegEq to: y1(x). Press ENTER to save. A screen will appear with the equation (write this down if you want the equation). Press ENTER and this equation will automatically go in y1 for the graph. Press F3 to view LOBF.

8. Sketch a scatter plot using TI-83/84. Relative Humidity (%) 0102030405060708090100 Apparent Temperature 6465676870717273747576 Press STAT, select Edit. If needed, clear lists: arrow up to highlight L1, press CLEAR and ENTER. Enter data into L1 and L2. Turn plots on/off – STATPLOT: Press 2 nd Y= for Statplot. Select Plot 1. Turn Plot on, X list: L1, Y list: L2.

9. Sketch a scatter plot using TI-83/84. Relative Humidity (%) 0102030405060708090100 Apparent Temperature 6465676870717273747576 Display the Y= by pressing Y=. Clear any existing equations in y1, y2, etc. Adjust window and view graph of scatter plot. -or- press ZOOM and select 9: ZoomStat.

10. Sketch a scatter plot using TI-83/84. Relative Humidity (%) 0102030405060708090100 Apparent Temperature 6465676870717273747576 Press STAT, arrow over to CALC, select 4:LinReg – press 2 nd 1 to select L1, type a comma, press 2 nd 2 to select L2, type a comma, press VARS, arrow over to Y-VARS, select Function, select Y1. Press ENTER. A screen will appear with the equation (write this down if you want the equation). The equation will automatically go into y1. Press GRAPH to view LOBF.