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- Notes for the ti-83, 83+, 84
To deselect equations:
- Access the list of equations.
- Select each equal sign (=).
- Continue, until all equations are deselected.
To clear equations:
- Access the list of equations.
- Use the arrow keys to navigate to the right of each equal sign (=) and clear them.
- Repeat until all equations are deleted.
To draw default histogram:
- Access the ZOOM menu.
- Select
<9:ZoomStat>
- The histogram will show with a window automatically set.
To draw custom histogram:
- Access
to set the graph parameters.
-
-
-
-
(width of bars)
-
-
-
(spacing of tick marks on y-axis)
-
- Access
to see the histogram.
To draw box plots:
- Access graphing mode.
,
[STAT PLOT]
- Select
<1:Plot 1>
to access the first graph.
- Use the arrows to select
<ON>
and turn on Plot 1.
- Use the arrows to select the box plot picture and enable it.
- Use the arrows to navigate to
<Xlist>
- If "L1" is not selected, select it.
,
[L1]
,
- Use the arrows to navigate to
<Freq>
.
- Indicate that the frequencies are in
[L2]
.
,
[L2]
,
- Go back to access other graphs.
,
[STAT PLOT]
-
Be sure to deselect or clear all equations before graphing using the method mentioned above.
- View the box plot.
,
[STAT PLOT]
Linear regression
Sample data
The following data is real. The percent of declared ethnic minority students at De Anza College for selected years from 1970 - 1995 was:
Year |
Student Ethnic Minority Percentage |
1970 |
14.13 |
1973 |
12.27 |
1976 |
14.08 |
1979 |
18.16 |
1982 |
27.64 |
1983 |
28.72 |
1986 |
31.86 |
1989 |
33.14 |
1992 |
45.37 |
1995 |
53.1 |
The independent variable is "Year," while the independent variable is "Student Ethnic Minority Percent."
The TI-83 has a built-in linear regression feature, which allows the data to be edited.The x-values will be in
[L1]
; the y-values in
[L2]
.
To enter data and do linear regression:
- ON Turns calculator on
- Before accessing this program, be sure to turn off all plots.
- Access graphing mode.
,
[STAT PLOT]
- Turn off all plots.
,
- Round to 3 decimal places. To do so:
- Access the mode menu.
,
[STAT PLOT]
- Navigate to
<Float>
and then to the right to
<3>
.
- All numbers will be rounded to 3 decimal places until changed.
- Enter statistics mode and clear lists
[L1]
and
[L2]
, as describe above.
,
- Enter editing mode to insert values for x and y.
,
- Enter each value. Press
to continue.
To display the correlation coefficient:
- Access the catalog.
,
[CATALOG]
- Arrow down and select
<DiagnosticOn>
... ,
,
-
and
will be displayed during regression calculations.
- Access linear regression.
- Select the form of
,
The display will show:
Linreg
-
-
-
-
-
This means the Line of Best Fit (Least Squares Line) is:
-
-
The correlation coefficient
To see the scatter plot:
- Access graphing mode.
,
[STAT PLOT]
- Select
<1:plot 1>
To access plotting - first graph.
- Navigate and select
<ON>
to turn on Plot 1.
<ON>
- Navigate to the first picture.
- Select the scatter plot.
- Navigate to
<Xlist>
- If
[L1]
is not selected, press
,
[L1]
to select it.
- Confirm that the data values are in
[L1]
.
<ON>
- Navigate to
<Ylist>
- Select that the frequencies are in
[L2]
.
,
[L2]
,
- Go back to access other graphs.
,
[STAT PLOT]
- Use the arrows to turn off the remaining plots.
- Access
to set the graph parameters.
-
-
-
(spacing of tick marks on x-axis)
-
-
-
(spacing of tick marks on y-axis)
-
- Be sure to deselect or clear all equations before graphing, using the instructions above.
- Press
to see the scatter plot.
Source:
OpenStax, Collaborative statistics. OpenStax CNX. Jul 03, 2012 Download for free at http://cnx.org/content/col10522/1.40
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