Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
Drexel University or The Math Forum.



Storying Data on TI82/83
Posted:
Jul 20, 1996 10:36 AM


Below is a text draft (without graphics) of a detailed description of the advantages of storing data in programs in TI graphing calculators and a stepbystep explanation of how to accomplish this. Bill Roloff first described this in a previous email and there seemed to be agreement among those of us at Fred Djang's AP Stats course (last week  fun and very productive  thanks Fred) that this was the way to go.
DRAFT EFFICIENT STORING OF STATISTICAL DATA IN THE TI82 AND TI83 FOR AP STATISTICS
Many AP Statistics courses will utilize TI82 and/or TI83 calculators for analyzing data. While many courses will also use student versions of statistical software residing on computers, graphing calculators will provide a consistent tool which students are most likely to have both in class and at home.
Teachers will use a large number of data sets supplied on disk, downloaded from the Internet, and created by students. For example, extensive data sets from textbooks and activity books are often provided by their publishers. However, data sets are rarely in a form which will load directly into the statistical lists of the calculators.
Since there will be many more data sets than can be stored in a calculator at any one time, the data sets must eventually be stored on a computer. Sets can then be downloaded to a calculator as necessary using the TIGraph Link.
A BETTER WAY TO STORE DATA
Before transforming data into TI82/3 formats, an important decision needs to be made about how the data sets will be stored in the calculator. Students will need to store more than one data set in a calculator so that a reasonable number of sets will be available for a few nights homework or to use class time efficiently.
The traditional method of storing data sets for statistical analysis in the calculator is to use lists which are then grouped in one file by the TILink software. However, this method has the following disadvantages:
* It is difficult to store more than one or two data sets in the TI82 at any given time.
* Data sets which each contain a list with the same name cannot be maintained in the calculator without changing names.
* If the data in the calculator is corrupted there is no way to reconstruct it without reloading from either a computer or another TI calculator.
* The TI83 software for the TIGraph Link does not allow viewing of grouped lists before downloading to the computer. (Groups must be ungrouped before viewing)
However, these disadvantages can be overcome by storing each set of data in a separate program as explained below (end note 1). An additional advantage of storing data in programs is that it takes less storage.
STORING DATA IN PROGRAMS IN A TI83
Note: This section uses features of the TI83 which are not available on the TI82. When teaching in an environment which is either all TI82 or mixed TI82/TI83 there are advantages in using ONLY the method described in the section Storing Data In Programs In a TI82.
The following program stores distance and fare data for an airline (end note 2) in two lists of data named DIST and FARE.
PROGRAM:AIRFARE SetUpEditor DIST,FARE {576,370,612,1216,409,1502,946,998,189,787,210,737} > DIST {178,138,94,278,158,258,198,188,98,179,138,98} > FARE
While programs can be entered directly into the calculator, there is an easier way to enter the actual data:
A. Have the data stored in the TI83 in lists DIST and FARE
B. Create a new program call AIRFARE:
Press PRGM. Select NEW. Press ENTER. Enter AIRFARE. Press ENTER.
C. Enter the SetUpEditor statement:
Press STAT. Select SetUpEditor. Press ENTER. Press LIST. Select DIST from the list of names. Press "," (the comma key). Press LIST. Select FARE from the list of names. Press ENTER.
Note: "SetUpEditor" forces only the lists DIST and FARE to be displayed in STAT EDIT after the program is executed. If they do not already exist, empty lists DIST and FARE will be created.
D. The following steps transfer the actual data from the lists to the program:
Press RCL. Press LIST. Select DIST from the list of names. Rcl LDIST will appear at the bottom of the screen. Press ENTER. The actual data will be entered into the program. Press STO>. Press LIST. Select DIST from the list of names. Press ENTER
E. Repeat the process above for the list FARE.
STORING DATA IN PROGRAMS IN A TI82
The following program stores distance and fare data for an airline (end note 3) in two lists of data named L1 and L2.
PROGRAM:AIRFARE {576,370,612,1216,409,1502,946,998,189,787,210,737} > L1 {178,138,94,278,158,258,198,188,98,179,138,98} > L2
While programs can be entered directly into the calculator, there is an easier way to enter the actual data:
A. Have the data stored in the TI82/3 in lists L1 and L2
B. Create a new program call AIRFARE:
Press PRGM. Select NEW. Press ENTER. Enter AIRFARE. Press ENTER.
C. The following steps transfer the actual data from the lists to the program:
Press RCL. Press L1. Rcl L1 will appear at the bottom of the screen. Press ENTER. The actual data will be entered into the program. Press STO>. Press L2. Press ENTER
D. Repeat the process above for the list L2.
 1 Bill Roloff of Lake Park HS, Rosell, IL suggested this method on the AP Statistics Listserver. 2 From Workshop Statistics, Allan Rossman 3 From Workshop Statistics, Allan Rossman
Albert Coons Buckingham Browne & Nichols School Cambridge, MA 02138 (617) 5476100 X 264 alcoons@aol.com



