Academy Algebra Academy Algebra IIII

4.2: Building Linear Functions From DataHW: p.290-291(3-8 all,18 – by hand,20 – calc)

Bring your graphing calculator to class on MondayUnit 2 Test: Wednesday (3.1,3.2,2.2,2.3,2.5,4.2)

1. 2.

3. 4.

4.2: Do Now: Determine whether 4.2: Do Now: Determine whether

the relationship between the two the relationship between the two

variables is linear or nonlinear.variables is linear or nonlinear.

Sketch a scatter plot by hand. Sketch a scatter plot by hand.

Draw and find the equation of the Draw and find the equation of the

line of best fit.line of best fit.

Relative Humidity (%)

0 10

20

30 40 50 60 70 80 90 100

Apparent Temperature(F)

64

65

67

68 70 71 72 73 74 75 76

Scatter plot & LOBF by hand.Scatter plot & LOBF by hand.

Relative Humidity

Ap

pare

nt

Tem

pera

ture

Sketch a scatter plot using TI-89. Sketch a scatter plot using TI-89. Relative Humidity (%)

0 10

20

30 40 50 60 70 80 90 100

Apparent Temperature

64

65

67

68 70 71 72 73 74 75 76

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.

Sketch a scatter plot using TI-Sketch a scatter plot using TI-89. 89.

Relative Humidity (%)

0 10

20

30 40 50 60 70 80 90 100

Apparent Temperature

64

65

67

68 70 71 72 73 74 75 76

Display the Y= by pressing <green diamond> F1.

Clear any existing equations in y1, y2, etc.

Adjust window and view graph of scatter plot.-or- press F2, select 9: ZoomData

Sketch a scatter plot using TI-Sketch a scatter plot using TI-89. 89.

Relative Humidity (%)

0 10

20

30 40 50 60 70 80 90 100

Apparent Temperature

64

65

67

68 70 71 72 73 74 75 76

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 <green diamond> F3 to view LOBF.

Sketch a scatter plot using TI-Sketch a scatter plot using TI-

83/84. 83/84. Relative Humidity (%)

0 10

20

30 40 50 60 70 80 90 100

Apparent Temperature

64

65

67

68 70 71 72 73 74 75 76

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 2nd Y= for

Statplot. Select Plot 1. Turn Plot on, X list: L1, Y list: L2.

Sketch a scatter plot using TI-Sketch a scatter plot using TI-

83/84. 83/84. Relative Humidity (%)

0 10

20

30 40 50 60 70 80 90 100

Apparent Temperature

64

65

67

68 70 71 72 73 74 75 76

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.

Sketch a scatter plot using TI-Sketch a scatter plot using TI-

83/84. 83/84. Relative Humidity (%)

0 10

20

30 40 50 60 70 80 90 100

Apparent Temperature

64

65

67

68 70 71 72 73 74 75 76Press STAT, arrow over to CALC, select 4:LinReg –

press 2nd 1 to select L1, type a comma, press 2nd 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.