STATISTICAL CALCULATIONS WITH A TI-83 PLUS/TI-84

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Purpose:
Some teachers require that students do a lot of arithmetic is calculating values such as the correlation coefficient and standard deviations in statistics. The purpose of this document is to familiarize the reader with methods of using lists to do arithmetic that will save many calculations when calculating such values.

Entering Data:  Press STAT, ENTER and the lists will be displayed.

Clearing a list:  Move the cursor so that the name is highlighted and press CLEAR, then ENTER.  See Figure 1 below. Figure 1:  Clearing a list.

Entering Data:  Position the cursor where you want to enter data, enter the number, and press ENTER.

Squaring the numbers in a list: Suppose we want to square the numbers in L1 and store the results in L3.   First position the cursor so that the name of the destination list is highlighted.  Next press 2ND, L1,x², ENTER.  The operation will be displayed at the bottom of the screen.  (See Figure 2 below.)  Press ENTER to store the numbers in L3. Figure 2.  Storing squared L1 values in L3.

Next Square L2 and store the results in L4:  Move the cursor to highlight the name of list L4. Press 2nd, L2, x².  (See Figure 3 below.)  Press ENTER to store the squared data in L4. Figure 3.  Square y-values and store in L4.

Multiplying two lists:  Suppose we want to multiply two lists, for example “x” in L1 times y in L2, and store the results in L5.  Move the cursor so that the name for L5 is highlighted.  Press 2nd, L1,x
(multiply sign),2nd, L2.  (See Figure 4 below.)  Now press ENTER and the products will be stored in L5 Figure 4: Multiplying L1 times L2.

Getting the sum of a list:  You must first get out of the list Edit function by pressing 2nd, QUIT (the MODE key).  The list menu will be displayed.  Move the cursor over to MATH (see figure 5 below) and press 5 to paste “sum(“ to the home screen.  (See Figure 6 below.)  Now, press 2nd, L1 (the number 1 key), and ENTER.  The sum will be displayed as in Figure 6 below. Figure 5:   Display of list MATH menu. Figure 6:  Display of sum(L1.

Getting the sums of the remaining lists:   You need not go through all of the steps again.  Merely press 2nd, ENTER to redisplay the entry for the sum of L1.  Now, position the cursor so that L1 is highlighted and press 2nd, L2 .  Press ENTER to get the sum of L2.  Repeat these steps for each list.  Part of the final screen is displayed in Figure 6 below. Figure 6:  Repeated summing of lists by re-displaying and editing a summation.

Released: 3/15/11
Last Revised: 3/15/11 