Transcript Section 1.2, Example 7

U.S. Executions
example 7
The table gives the number of executions in the United States for selected years from
1984 to 2005. (Source: “The Death Penalty in the U.S.,” www.clarkprosecuter.org)
Year
Number of
Executions
1984
21
1987
25
1990
23
1993
38
1996
45
1999
98
2002
71
2005
60
a. Align the data so that x = the number of years after
1980, and enter these x-values in list L1. Enter the
number of executions in L2.
b. Use a graphing command to create the scatter plot of
these data points.
Chapter 1.2
2009 PBLPathways
The table gives the number of executions in the United States for selected years from
1984 to 2005. (Source: “The Death Penalty in the U.S.,” www.clarkprosecuter.org)
Year
Number of
Executions
1984
21
1987
25
1990
23
1993
38
1996
45
1999
98
2002
71
2005
60
a. Align the data so that x = the number of years after
1980, and enter these x-values in list L1. Enter the
number of executions in L2.
2009 PBLPathways
The table gives the number of executions in the United States for selected years from
1984 to 2005. (Source: “The Death Penalty in the U.S.,” www.clarkprosecuter.org)
Year
Number of
Executions
1984
21
1987
25
1990
23
1993
38
1996
45
1999
98
2002
71
2005
60
a. Align the data so that x = the number of years after
1980, and enter these x-values in list L1. Enter the
number of executions in L2.
b. Use a graphing command to create the scatter plot of
1984  1980  4
these data points. 
x  1987  1980  7


2009 PBLPathways
The table gives the number of executions in the United States for selected years from
1984 to 2005. (Source: “The Death Penalty in the U.S.,” www.clarkprosecuter.org)
x
Number of
Executions
4
21
7
25
10
23
13
38
16
45
19
98
22
71
25
60
a. Align the data so that x = the number of years after
1980, and enter these x-values in list L1. Enter the
number of executions in L2.
b. Use a graphing command to create the scatter plot of
1984  1980  4
these data points. 
x  1987  1980  7


2009 PBLPathways
The table gives the number of executions in the United States for selected years from
1984 to 2005. (Source: “The Death Penalty in the U.S.,” www.clarkprosecuter.org)
x
Number of
Executions
4
21
7
25
10
23
13
38
16
45
19
98
22
71
25
60
b. Use a graphing command to create the scatter plot of
these data points.
x
2009 PBLPathways
The table gives the number of executions in the United States for selected years from
1984 to 2005. (Source: “The Death Penalty in the U.S.,” www.clarkprosecuter.org)
x
Number of
Executions
4
21
7
25
10
23
13
38
16
45
19
98
22
71
25
60
b. Use a graphing command to create the scatter plot of
these data points.
x
2009 PBLPathways
The table gives the number of executions in the United States for selected years from
1984 to 2005. (Source: “The Death Penalty in the U.S.,” www.clarkprosecuter.org)
x
Number of
Executions
4
21
7
25
10
23
13
38
16
45
19
98
22
71
25
60
b. Use a graphing command to create the scatter plot of
these data points.
x
2009 PBLPathways
The table gives the number of executions in the United States for selected years from
1984 to 2005. (Source: “The Death Penalty in the U.S.,” www.clarkprosecuter.org)
x
Number of
Executions
4
21
7
25
10
23
13
38
16
45
19
98
22
71
25
60
b. Use a graphing command to create the scatter plot of
these data points.
2009 PBLPathways
Clear the lists
1. Press the
key.
2. Since lists L1 and L2 may have data in
them already, you’ll start by selecting
4: ClrList. Press . This pastes
ClrList on the Home Screen.
3. Now you need to indicate the lists you
want to clear. Press
followed by . You can enter as many
lists as you want as long as they are
separated by .
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Alternate method for clearing lists
4. You can also clear a list by pressing
and selecting 1: Edit.
5. This takes you to the list editor. Move
your cursor to the top of the column
that you want to clear.
6. To clear the list, press
. The entries
in that column will be cleared. You
can move the cursor to the tops of
other columns and clear those too.
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Enter the data points
7. Press the
key.
8. Press to select 1:Edit or move the
cursor to 1:Edit and press . This
brings you to the screen where you
can enter the data in the lists.
9. Enter the Years from 1980-values in
list L1. Use the down arrow , right
arrow or to move from line to
line or column to column.
10. Enter the Number of executionsvalues in L2.
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Set the window
11. Press the
key.
12. After you examine the data, choose
window values that include these
values and some “space” above and
below the highest and lowest values
of x and y.
13. Set the window elements to
Xmin = 0, Xmax = 30, Xscl = 5,
Ymin = 0, Ymax = 120, and
Yscl = 20. Press the down arrow or
to move from line to line.
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Use STAT PLOT to turn on and format
the scatter plot of data points
14. Press
to access STAT PLOT.
15. Select 1: Plot 1 ON, press
.
16. Select Type: first one for a scatter
plot – individual points, press .
17. On the same screen select
XList: L1or whichever list has the
x-data
YList: L2 or whichever list has the
y-data
Mark: any one you wish
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18. Press the  key to see the scatter plot.
19. Use  and the right arrow to move
from point to point. The x and y
coordinates of each point are
displayed at the bottom of the screen.
20. P1:L1,L2 is displayed in the upper
left hand corner of the screen. This
tells you that you are on Plot 1, the x’s
are from list L1, and the y’s are from
list L2.
21. You can also turn a STAT PLOT on
or off from the equation editor. To
access the equation editor, press .
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22. Use the arrow keys to navigate the
cursor to Plot 1, Plot 2, or Plot 3. You
can turn a plot on by highlighting the
appropriate plot. Press  to turn the
plot on or off.
2009 PBLPathways