14.6 Notes for the ti-83, 83+, 84 calculator  (Page 2/3)

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To deselect equations:

1. Access the list of equations.

2. Select each equal sign (=).

3. Continue, until all equations are deselected.

To clear equations:

1. Access the list of equations.

2. Use the arrow keys to navigate to the right of each equal sign (=) and clear them.

3. Repeat until all equations are deleted.

To draw default histogram:

2. Select <9:ZoomStat>

3. The histogram will show with a window automatically set.

To draw custom histogram:

• ${X}_{\mathrm{min}}=-2.5$
• ${X}_{\mathrm{max}}=3.5$
• ${X}_{\mathrm{scl}}=1$ (width of bars)
• ${Y}_{\mathrm{min}}=0$
• ${Y}_{\mathrm{max}}=10$
• ${Y}_{\mathrm{scl}}=1$ (spacing of tick marks on y-axis)
• ${X}_{\mathrm{res}}=1$

To draw box plots:

1. Access graphing mode.

, [STAT PLOT]

2. Select <1:Plot 1> to access the first graph.

3. Use the arrows to select <ON> and turn on Plot 1.

4. Use the arrows to select the box plot picture and enable it.

5. Use the arrows to navigate to <Xlist>
6. If "L1" is not selected, select it.

, [L1] ,

7. Use the arrows to navigate to <Freq> .
8. Indicate that the frequencies are in [L2] .

, [L2] ,

9. Go back to access other graphs.

, [STAT PLOT]

10. Be sure to deselect or clear all equations before graphing using the method mentioned above.
11. View the box plot.

, [STAT PLOT]

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 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:

1. ON Turns calculator on

2. Before accessing this program, be sure to turn off all plots.
• Access graphing mode.

, [STAT PLOT]

• Turn off all plots.

,

3. Round to 3 decimal places. To do so:

, [STAT PLOT]

• Navigate to <Float> and then to the right to <3> .

• All numbers will be rounded to 3 decimal places until changed.

4. Enter statistics mode and clear lists [L1] and [L2] , as describe above.

,

5. Enter editing mode to insert values for x and y.

,

6. Enter each value. Press to continue.

To display the correlation coefficient:

1. Access the catalog.

, [CATALOG]

2. Arrow down and select <DiagnosticOn>

... , ,

3. $r$ and $r^{2}$ will be displayed during regression calculations.
4. Access linear regression.

5. Select the form of $y=a+bx$

,

The display will show:

Linreg

• $y=a+bx$
• $a=-3176.909$
• $b=1.617$
• $r^{2}=0.924$
• $r=0.961$

This means the Line of Best Fit (Least Squares Line) is:

• $y=-3176.909+1.617x$
• $\mathrm{Percent}=-3176.909+1.617\mathrm{\left(year #\right)}$
The correlation coefficient $r=0.961$

To see the scatter plot:

1. Access graphing mode.

, [STAT PLOT]

2. Select <1:plot 1> To access plotting - first graph.

3. Navigate and select <ON> to turn on Plot 1.

<ON>

4. Navigate to the first picture.
5. Select the scatter plot.

6. Navigate to <Xlist>
7. If [L1] is not selected, press , [L1] to select it.
8. Confirm that the data values are in [L1] .

<ON>

9. Navigate to <Ylist>
10. Select that the frequencies are in [L2] .

, [L2] ,

11. Go back to access other graphs.

, [STAT PLOT]

12. Use the arrows to turn off the remaining plots.
• ${X}_{\mathrm{min}}=1970$
• ${X}_{\mathrm{max}}=2000$
• ${X}_{\mathrm{scl}}=10$ (spacing of tick marks on x-axis)
• ${Y}_{\mathrm{min}}=-0.05$
• ${Y}_{\mathrm{max}}=60$
• ${Y}_{\mathrm{scl}}=10$ (spacing of tick marks on y-axis)
• ${X}_{\mathrm{res}}=1$
14. Be sure to deselect or clear all equations before graphing, using the instructions above.
15. Press to see the scatter plot.

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currently
William
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