1 FUNCTIONS AND MODELS

4.
)
4
π
(sin x + 1 3 sin 3x + 1 5 sin 5x
CHAPTER 1
FUNCTIONS AND MODELS
y
1
_6 _4 _2 0 2 4 6 x
5.
(
4 sin 3x
sin x +
π
3
+
sin 5x
5
+
sin 7x
7
+
sin 9x
9
+
_1
sin 11x
11
+
sin 13x
13
+
sin 15x
15
+
sin 17x
17
+
)
sin 19x
19
y
1
_2¹
_¹
¹ 2¹
x
_1
6. y
¹/2
_2¹ _¹ 0
_¹/2
¹ 2¹
x
USING A GRAPHING CALCULATOR TO DO REGRESSION ANALYSIS
The following instructions assume the use of a TI-85 calculator.
• Under the STAT menu select EDIT.
• Choose desired lists for x-andy-coordinates.
• Enter the x-andy-coordinates of the data.
• In graph mode, set approximate ranges so points can be viewed. Erase or deselect all functions.
• In default window, choose a regression model:
• ExpR (Exponential regression)
• LinR (Linear regression)
• LnR (Logarithmic regression)
• P2Reg (Quadratic regression)
• P3Reg (Cubic regression)
• P4Reg (Quartic regression)
• Under STAT mode, select DRAW.
• Select SCAT to plot data points.
• Select DRREG to plot the regression model.
• Move cursor along regression plot to get approximations for interpolation.
8