TI BA II Plus title

The position of the graphically represented keys can be found by moving your mouse on top of the graphic. 

Turn your calculator on
Press Row 1, Column 5.
Clearing the memory
Press The Second Key: Row 2, Column 1 The Key is White Row 9, Column 1. (The CE/C key will have "CLR Work" written above it.)

 

Entering data
one variable
Press The Second Key: Row 2, Column 1 The Key is White Row 6, Column 2 (the 7 key should have the word DATA written above it). You should see X01= on the screen. Enter the first number, then press Row 1, Column 2 The Down Arrow Key: Row 1, Column 4 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4. You should see X02= on the screen. Enter the next number, then press Row 1, Column 2 The Down Arrow Key: Row 1, Column 4 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4. Continue until you are done with the list.
two variables
Press The Second Key: Row 2, Column 1 The Key is White Row 6, Column 2 (the 7 key should have the word DATA written above it). You should see X01= on the screen. Enter the first x-value, then press Row 1, Column 2 The Down Arrow Key: Row 1, Column 4. You will see Y01= on the screen. Enter the first y-value, then Row 1, Column 2 The Down Arrow Key: Row 1, Column 4. You should see X02= on the screen. Enter the second x-value, Row 1, Column 2 The Down Arrow Key: Row 1, Column 4, the second y-value, Row 1, Column 2 The Down Arrow Key: Row 1, Column 4. Continue until you are done with the list.

 

Calculating one-variable statistics
mean (x)
Press The Second Key: Row 2, Column 1 The Key is White Row 6, Column 3 (You will see the word Stat above the 8 key.) You will see the word LIN on the screen. Press The Down Arrow Key: Row 1, Column 4 and you'll see the number of numbers in your list. Press The Down Arrow Key: Row 1, Column 4 again and you'll see the mean of your list.
standard deviation for populations (s or sn)
Press The Second Key: Row 2, Column 1 The Key is White Row 6, Column 3 (You will see the word Stat above the 8 key.) You will see the word LIN on the screen. Press The Down Arrow Key: Row 1, Column 4 four times to see sx. (If you have just finished computing the mean, you only need to press The Down Arrow Key: Row 1, Column 4 two more times.)
standard deviation for samples (s or sn-1)
Press The Second Key: Row 2, Column 1 The Key is White Row 6, Column 3 (You will see the word Stat above the 8 key.) You will see the word LIN on the screen. Press The Down Arrow Key: Row 1, Column 4 three times to see sx

Calculating two-variable statistics
r (correlation)
Press The Second Key: Row 2, Column 1 The Key is White Row 6, Column 3 (You will see the word Stat above the 8 key.) You will see the word LIN on the screen. Press The Down Arrow Key: Row 1, Column 4 ten times to see r. Alternatively, you can also press Row 1, Column 3 eight times to see r.
regression coefficients
slope
Press The Second Key: Row 2, Column 1 The Key is White Row 6, Column 3 (You will see the word Stat above the 8 key.) You will see the word LIN on the screen. Press The Down Arrow Key: Row 1, Column 4 nine times to see the slope (labeled as b).
y-intercept
Press The Second Key: Row 2, Column 1 The Key is White Row 6, Column 3 (You will see the word Stat above the 8 key.) You will see the word LIN on the screen. Press The Down Arrow Key: Row 1, Column 4 eight times to see the y-intercept (labeled as a).


Calculating combinations and permutations
combinations (nCr)
Enter n, press The Second Key: Row 2, Column 1 The Key is White The Plus Key: Row 7, Column 5 (You should see nCr above the plus key). Enter r, then press Rows 8 and 9, Column 5 (Hey, it's a large key.).
permutations (nPr)
Enter n, press The Second Key: Row 2, Column 1 The Key is White Row 6, Column 5 (You should see nPr above the minus key). Enter r, then press Rows 8 and 9, Column 5 (Hey, it's a large key.).

 

Turning the calculator off
Press Row 1, Column 5.

 

Worked Out Examples

In the following examples, we list the exact key sequence used to find the answer.  We will list the keys by the main symbol on the key.  In parentheses, we will list a helpful mnemonic, e.g. we will list ex as (ex).


A: What is the mean and standard deviation of the following list of numbers?

15      16      20      21

1: Clear Memory  The Second Key: Row 2, Column 1 The Key is White Row 9, Column 1
2: Enter Data  The Second Key: Row 2, Column 1 The Key is White Row 6, Column 2 (Data) Row 8, Column 2 Row 7, Column 3 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4 Row 8, Column 2 Row 7, Column 4 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4 Row 8, Column 3 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4 Row 1, Column 2  
 The Down Arrow Key: Row 1, Column 4 Row 8, Column 3 Row 8, Column 2 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4 
3: Compute the mean   The Second Key: Row 2, Column 1 The Key is White Row 6, Column 3 (Stat) The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 
4: Compute the standard deviation (population)  The Second Key: Row 2, Column 1 The Key is White Row 6, Column 3 (Stat) The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4
5: Compute the standard deviation (sample)  The Second Key: Row 2, Column 1 The Key is White Row 6, Column 3 (Stat) The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4


     You should get a mean of 18, population standard deviation of 2.549509757 and a sample standard deviation of 2.943920289.

B: Find the linear regression line for the following table of numbers. Also find the correlation.

x 1 2 3 4
y 2 4 5 7

1: To start  The Second Key: Row 2, Column 1 The Key is White Row 9, Column 1
2: Enter Data  The Second Key: Row 2, Column 1 The Key is White Row 6, Column 2 (Data) Row 8, Column 2 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4  Row 8, Column 3 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4  Row 8, Column 4  
  Row 1, Column 2 The Down Arrow Key: Row 1, Column 4 Row 7, Column 2 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4 Row 8, Column 3 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4 Row 7, Column 2 Row 1, Column 2  
 The Down Arrow Key: Row 1, Column 4  Row 7, Column 3 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4  Row 6, Column 2 Row 1, Column 2 The Down Arrow Key: Row 1, Column 4
3: Compute the slope of the regression line  The Second Key: Row 2, Column 1 The Key is White Row 6, Column 3 (Stat) The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4  
  The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4  
4: Compute the y-intercept of the regression line  The Second Key: Row 2, Column 1 The Key is White Row 6, Column 3 (Stat) The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4  
  The Down Arrow Key: Row 1, Column 4 
5: Compute the correlation  The Second Key: Row 2, Column 1 The Key is White Row 6, Column 3 (Stat) The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4  
  The Down Arrow Key: Row 1, Column 4  The Down Arrow Key: Row 1, Column 4 The Down Arrow Key: Row 1, Column 4


    You should get a slope of 1.6, a y-intercept of 0.5, and a correlation of 0.992277876.
    The regression line would be: y = 1.6x+0.5.

C: Find 10C6 and 9P5.
1: Compute 10C6  Row 8, Column 2 The Second Key: Row 2, Column 1 The Key is White The Plus Key: Row 7, Column 5 Row 7, Column 4 Rows 8 and 9, Column 5 (Hey, it's a large key.).
2: Compute 9P5   The Second Key: Row 2, Column 1 The Key is White Row 6, Column 5 Row 7, Column 3 Rows 8 and 9, Column 5 (Hey, it's a large key.).


You should get 10C6 = 210 and 9P5= 15120.

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