Ti 89 what does sign mean

As noted above, we want to use the OneVar command. We could type this command. However, that would require a number of keystrokes and it would require that we completely remember the command that we want to use. A method for manufacturing the OneVar command is to find that command in the catalog, a list of commands on the calculator. We open that catalog by pressing the key. Figure 8 shows the catalog window.

The contents of the catalog are arranged alphabetically. The pointer is at the first entry, abs. We need to move that pointer down the list to find our desired command. One way to jump down, or up, the list is to press the key associated with the first character of the command we want.

In our case, we want the OneVar command. Therefore, we press the key that is associated with the letter " o ", namely the key. Pressing that one key causes the calculator to jump down the catalog names to the o 's. Fortunately for us, the first " o " command is the one we want, OneVar. Figure 9 shows that command at the top of the list with the selector arrow pointing to it. A careful examination of the screen in Figure 9 reveals that the calculator gives us some helpful hints about the appropriate use of the OneVar command.

At the very bottom left of the screen we find the new message. This is information about the required and the optional parameters that are to follow the OneVar command. In this case we note that the command is to be followed by at least one list, and possibly by as many as four lists. We press the key to actually select the OneVar command from Figure 9 and to paste it into the command line, replacing our entire former command, as is shown in Figure As noted in the discussion following Figure 9, the OneVar command needs to be followed by the name of a list.

Quite by accident, our list is named " l1 " much like the " l1 " suggested by the calculator in Figure 9. We will enter our name for our list in Figure We enter our list name by pressing the keys.

Figure 11 shows our complete command. Now we press to perform the OneVar command. Figure 12 illustrates the results of that command. It almost appears as if the command did nothing. The only thing that has changed is that we have the command added to the history area, at the bottom left, and the word " Done " has been added to the lower right of the history area. Unfortunately, the OneVar command instructs the calculator to do certain computations, but it does not cause the TI to display those results.

The " Done " is our only indicator that the command was successfully completed. We still need to find some way to see the results of the OneVar command. The command to show those results is the ShowStat command. Again, we can find it in the catalog, which we re-open via the key.

Note that the catlog appears just as we left it in Figure 9. We are looking for the ShowStat command. To move down the command list to the " S's " we press the key. The calculator display shifts to that shown in Figure Unfortunately, there are many commands that start with the letter S.

Our desired command is not even on the screen yet. We can press the key 11 times to move down to the ShowStat command, as has been done in Figure Note that we merely want the selector arrow to be pointing to the ShowStat command. Having selected the ShowStat command in Figure 15, we press to place that command into the command line in Figure Once the command is in place in Figure 16, we press again to perform the command.

Figure 17 displays the window that the ShowStat command opens. That window indicates that the mean of the data is 3. The fourth value, gives an estimate of a standard deviation based on a sample. This statistic is beyond the scope of the material presented here. The next three lines in the window indicate that the number of items in the list is 21, that the lowest value in the list is 1, and that the first quartile point is at 1.

The final line in the window, , gives us the median value of the list as being 3. Although, at first, there is no special indication of the fact, we might suppose that there is even more to see in this window. After all, we have seen the first quartile, but not the third, and we have seen the minimum value, but not the maximum value in the list. A closer examination shows that the equal sign in the line is really a tiny arrow pointing down. This seems to be meant as our only on-screen indication that more information is available.

We press the key 2 times to shift the display to that shown in Figure Here we see the final two values: the third quartile is at 5 and the maximum value is 6. At the same time, note that the equal sign for the median , the medStat line, is now correctly formed, whereas, the equal sign in the top output line of the window now has its equal sign contorted to be an up-arrow.

We have seen all that the ShowStat command has to offer. We press the to close that window. We do need to recognize that ShowStat displays the results computed by the OneVar command issued earlier. The two commands need to be given to compute the values and then to display those values. We might have noticed that the S howStat command does not display the population standard deviation for our values.

This is a value that is computed by the OneVar command. It is just not displayed by ShowStat on the TI We would like to see the value of the population standard deviation. It is stored in a system variable called.

We will need to generate that name. We can use the TI menu system to do this. In Figure 20, the Greek option was highlighted, and that is the option we want. We open the Greek sub-window by pressing the key. Figure 21 shows that window. Our desired Greek character, , is not in that window. However the down-arrow on the sixth line suggests that more characters follow. We move down the sub-window by pressing the key until we find the desired character, as shown in Figure Now we paste that character into the command line by pressing the key.

Note: we have used the TI menus to generate the Greek letter sigma,. An alternative method to generate the sigma character is to remember the sequence.

Of course, we wanted not just , so we need to complete our command by pressing. This produces the command line shown in Figure Press to perform that command. The result is shown in Figure 25 where the history area holds the command and the associated value, 1. This is the population standard deviation of the numbers in our original list.

We could do this by typing the characters, or we could find the program in the variable listing on the TI We will choose this second approach. Note that the calculator used here has many programs and variables defined on it. If you are following along on a different calculator, then your display will be different, reflecting your different list of available programs and variables.

As before, we can move to the names that start with the letter "C" by pressing the key. On this calculator that action took our selection highlight directly to the collate3 program item. Pressing copies collate3 to the command line, along with a left parenthesis. Programs on the TI are followed by a possible list of parameters enclosed in parentheses. We complete our command by adding the required closing parenthesis by pressing the key.

In Figure 29 we completed forming the desired command. We press the key to start the program. Note how the TI hazes out the menu area. Those menu items are no longer available. The program has prompted us for the name of the list of values that we wish it to process. We respond to the prompt of Figure 30 by pressing the keys to generate our list name, l1. Having typed the list name in Figure 31, we use to submit that name to the program.

The collate3 program will process that list of values and it will produce many lines of output that just flow across the input-output screen. Finally, when the entire l1 list has been processed, the collate3 program pauses as shown in Figure Note the indicator in the lower right corner of the screen. We press to continue the program. The output gives us the details on the frequency distribution of the values in the original list.

From Figure 33 we can see that the number 1 appears 5 times in l1. The numbers 2, 3, 4, and 6 each appear 3 times, while the value 5 appears 4 times. Therefore, the mode value is 1. Again, the calculator is paused, waiting for our command to go on to its next step. Pressing the key moves us from Figure 33 to Figure The collate3 program concludes by producing a histogram of the input data values. In a subtle change, the calculator has also moved from the input-output screen of Figure 33 to the graphics screen of Figure Note that an entirely new set of menu options has appeared for Figure So far we have seen a three different kinds of screens.

We started on the HOME screen. The programs accept input and produce output on their own screen. And, there is a graphics screen.

To continue our work we will want to return to the HOME screen. We want to find the gnrnd9 program in the list. We press to jump to the start of the "G" entries in the window. On the calculator used to make these images, the first such "G" entry is "game". This is the situation shown in Figure We move from Figure 37 to Figure 38 by pressing the key 3 times to move the highlight to the gnrnd9 program entry. Presing the key will paste gnrnd9 and the left parenthesis onto the command line.

Then we press to enter the closing parenthesis. Again, the gnrnd9 program does not use parameters. Degree mode. Radian mode. Because this article helps you, please click to donate! Because this article helps you, please donate at BrownMath. Once only, you need to tell the TI that you want results in rectangular mode. Then press [ 1 ] for radian mode or [ 2 ] for degree mode.

Tell the calculator that you want results in polar mode. Caution : Degree mode is shown here by way of example. Enter numbers just as you see them. Engineers, use i instead of j. If the calculator is in degree mode, enter the angle in degrees, The degree sign is optional if the calculator is in degree mode. You want the Math, Matrix, Vector ops menu.

The form of the answer depends on the calculator mode: Degree mode Radian mode. Enter the closing parenthesis and find the answer, about This screen shot was made on a TI, but the TI produces identical results.