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

Turn your calculator on
Press The On Key - Keyboard Row 4, Far Left. 
Clearing the memory
This is not that much an issue as the TI-92 has tons of memory. Simply give your new list a different name. However, you cannot use a name if it's already in use, so you might want to delete a list if you're done with it. Press  The Second Key: Row 1, Column 1 The Minus Key: Row 8, Column 4 (it says VAR-LINK above the key). Press The Down Arrow until the cursor is on the list you want to delete. Press The F 1 Key: Left Side of Screen: Top of Column 1 The One Key: Row 9, Column 1 The Enter Key: Bottom Right Corner. Delete any other lists, if necessary. Then press The Escape Key: Row 1,2 Column 2 (Right Side is Curved) to get back to the main screen.

 

Entering data
one variable
Press The Apps Key: Rows 3,4 Column 2 (Big Blue Key with a graph and Y= on the key).  A menu will appear on the screen.  Press The Six Key: Row 8, Column 3 (Data/Matrix Editor), then press The Three Key: Row 9, Column 3 (New).  You'll see a window that says Type:.  If it already says Type: Data, press to accept.  If not, press to view the other options and pick Data then press to accept.  The cursor should now be on  Folder: Main.  Press to accept.  Pick an arbitrary name (say M) for the list. If it's in use, either choose another name or delete the list (see above for instructions). Press M on the keyboard portion.  Then press The Enter Key: Bottom Right Corner The Enter Key: Bottom Right Corner (twice) to accept and verify the name.  A table should appear with c1, c2, c3 over the columns.  Use c1 for one variable data.  Enter the first number.   Press The Enter Key: Bottom Right Corner.  Enter the second number.  Press The Enter Key: Bottom Right Corner.   Continue until all the data has been entered.
two variables
Press Row 2, Column 3.  A menu will appear on the screen.  Press Row 7, Column 4 (Data/Matrix Editor), then press Row 8, Column 4 (New).  You'll see a window that says Type:.  If it already says Type: Data, press to accept.  If not, press to view the other options and pick Data then press to accept.  The cursor should now be on  Folder: Main.  Press to accept.  Press  D on the keyboard portion.  (We're calling our dataset D; call it whatever you want using the keyboard keys; if you want to delete a list so you can reuse the name, use the Clear Memory instructions above).  Then press The Enter Key: Bottom Right Corner The Enter Key: Bottom Right Corner (twice) to accept and verify the name.  A table should appear with c1, c2, c3 over the columns.   Use c1 for the x-variable.   Enter the first x-value, then press .  Enter the second x-value, then .  Continue until all the x-values have been entered . Press to move the cursor to c2 for the y-variable.  Press as many times as necessary to get the cursor next to the first x-value. Enter the first y-value, then .  Enter the second y-value, then . Continue until all the y-values have been entered.  Make sure the corresponding x-values and y-values line up. 

 

Calculating one-variable statistics
mean (x)
Press ( CALC).  You'll see a row that says calculation type.  Press .  Press The One Key: Row 9, Column 1 (for One Var).  Press . You'll see x........and a box. Type The C Key (on the keyboard row 3, key number 3) The One Key: Row 9, Column 1 on the keyboard. Press The Enter Key: Bottom Right Corner The Enter Key: Bottom Right Corner and you'll see a chart. The first item in the chart is x, the mean.
standard deviation for populations (s or sn)
Press ( CALC).  You'll see a row that says calculation type.  Press .  Press The One Key: Row 9, Column 1 (for One Var).  You'll see a screen with  x, Sx, Sx2, etc.  Oddly enough, sx for the population is not on the list.  However, it has been calculated.  To locate it, return to the home screen by pressing Row 2, Column 3 The One Key: Row 9, Column 1.  At the bottom of the screen, type in The Second Key: Row 1, Column 1 G S (on the keyboard)  On the screen, you'll see s. Press The Enter Key: Bottom Right Corner. 
standard deviation for samples (s or sn-1)
Press ( CALC).  You'll see a row that says calculation type.  Press .  Press The One Key: Row 9, Column 1 (for One Var).  Press . You'll see x........and a box. Type The C Key (on the keyboard row 3, key number 3) The One Key: Row 9, Column 1. Press The Enter Key: Bottom Right Corner The Enter Key: Bottom Right Corner and you'll see a chart. Look for sx - that's the sample standard deviation.

Calculating two-variable statistics
r (correlation)
Press (CALC).  You'll see a row that says calculation type.  Press Row 7, Column 3 (for Lin Reg).  Press The C Key (on the keyboard row 3, key number 3) The One Key: Row 9, Column 1  (on the keyboard), The C Key (on the keyboard row 3, key number 3) The Two Key: Row 9, Column 2  (on the keyboard),  The Enter Key: Bottom Right Corner to tell the calculator which variables to do the regression on.  Then press Bottom Right Corner again to tell it to run the regression.  You'll see a screen with a =, b =, corr =,  R2 = .  The corr is what we're looking for here.  R2 is the square of the correlation.
regression coefficients
slope
Press (CALC).  You'll see a row that says calculation type.  Press Row 7, Column 3 (for Lin Reg).  Press The C Key (on the keyboard row 3, key number 3) The One Key: Row 9, Column 1  (on the keyboard), The C Key (on the keyboard row 3, key number 3) The Two Key: Row 9, Column 2  (on the keyboard), The Enter Key: Bottom Right Corner to tell the calculator which variables to do the regression on.  Then press The Enter Key: Bottom Right Corner again to tell it to run the regression.  You'll see a screen with a =, b =, corr =,  R2 = .   The b value is the slope of the regression line. 
y-intercept
Press (CALC).  You'll see a row that says calculation type.  Press Row 7, Column 3 (for Lin Reg).  Press The C Key (on the keyboard row 3, key number 3) The One Key: Row 9, Column 1  (on the keyboard), The C Key (on the keyboard row 3, key number 3) The Two Key: Row 9, Column 2 (on the keyboard), The Enter Key: Bottom Right Corner to tell the calculator which variables to do the regression on.  Then press The Enter Key: Bottom Right Corner again to tell it to run the regression.  You'll see a screen with a =, b =, corr =,  R2 = .  The a value is the y-intercept. 


Calculating combinations and permutations
combinations (nCr)
Press Row 1, Column 1 Row 7, Column 3 (MATH is written above the key).  You should see several options on the screen.  Press Row 6, Column 2 (PROB).  You will see more options.   nCr is the third option, so press Row 8, Column 4.  Enter the n value, then press Row 5 , Column 4.  Enter the r value, then press the Row 5 - Column 3 key.  Finally press The Enter Key: Bottom Right Corner.
permutations (nPr)
Press Row 1, Column 1 Row 7, Column 3 (MATH is written above the key).  You should see several options on the screen.  Press Row 6, Column 2 (PROB).  You will see more options.   nPr is the second option, so press .  Enter the n value, then press Row 5 , Column 4.  Enter the r value, then press the Row 5 - Column 3 key.  Finally press The Enter Key: Bottom Right Corner.

 

Turning the calculator off
Press Row 1, Column 1 Bottom Left Corner.

 

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: To start   The Second Key: Row 1, Column 1 The Minus Key: Row 8, Column 4 (VAR-LINK) The Down Arrow (as necessary) The F 1 Key: Left Side of Screen: Top of Column 1 The One Key: Row 9, Column 1 The Enter Key: Bottom Right Corner The Escape Key: Row 1,2 Column 2 (Right Side is Curved)  
2: Enter Data  Row 2, Column 3 Row 7, Column 4 Row 8, Column 4 (press an arbitrary letter on the keyboard)  Row 8, Column 2 Row 7, Column 3 Bottom Right Corner Row 8, Column 2 Row 7, Column 4 Bottom Right Corner Row 8, Column 3 Row 9, Column 2 Bottom Right Corner Row 8, Column 3 Row 8, Column 2 Bottom Right Corner  
3: Compute the mean   Row 8, Column 2 The C Key (on the keyboard row 3, key number 3) The One Key: Row 9, Column 1  
4: Compute the standard deviation (population)  Can't be done directly. 
5: Compute the standard deviation (sample)   Row 8, Column 2 The C Key (on the keyboard row 3, key number 3) The One Key: Row 9, Column 1  


    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 1, Column 1 The Minus Key: Row 8, Column 4 (VAR-LINK) The Down Arrow (as necessary) The F 1 Key: Left Side of Screen: Top of Column 1 The One Key: Row 9, Column 1 The Enter Key: Bottom Right Corner The Escape Key: Row 1,2 Column 2 (Right Side is Curved)  
2: Enter Data  Row 2, Column 3 Row 7, Column 4 Row 8, Column 4 Row 2, Column 1 It's Blue row 5, column 4 (D, but this is arbitrary) Bottom Right Corner Bottom Right Corner Row 8, Column 2 Bottom Right Corner Row 8, Column 3 Bottom Right Corner Row 8, Column 4 Bottom Right Corner Row 7, Column 2 Bottom Right Corner   Row 8, Column 3 Bottom Right Corner Row 7, Column 2 Bottom Right Corner Row 7, Column 3 Bottom Right Corner Row 6, Column 2 Bottom Right Corner The Escape Key: Row 1,2 Column 2 (Right Side is Curved)
3: Compute the slope of the regression line   Row 7, Column 3 The C Key (on the keyboard row 3, key number 3) The One Key: Row 9, Column 1  (on the keyboard), The C Key (on the keyboard row 3, key number 3) The Two Key: Row 9, Column 2  (on the keyboard), The Enter Key: Bottom Right Corner Bottom Right Corner  
4: Compute the y-intercept of the regression line   Row 7, Column 3 The C Key (on the keyboard row 3, key number 3) The One Key: Row 9, Column 1  (on the keyboard), The C Key (on the keyboard row 3, key number 3) The Two Key: Row 9, Column 2  (on the keyboard), The Enter Key: Bottom Right Corner Bottom Right Corner  
5: Compute the correlation   Row 7, Column 3 The C Key (on the keyboard row 3, key number 3) The One Key: Row 9, Column 1  (on the keyboard), The C Key (on the keyboard row 3, key number 3) The Two Key: Row 9, Column 2  (on the keyboard), The Enter Key: Bottom Right Corner Bottom Right Corner  


    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 1, Column 1 Row 7, Column 3 (MATH) Row 6, Column 2 (PROB) (nCr) Row 8, Column 2 Row 5 - Column 4 Row 5, Column 3 Bottom Right Corner
2: Compute 9P5   Row 1, Column 1 Row 7, Column 3 (MATH) Row 6, Column 2 (PROB) Row 8, Column 3 (nPr) Row 6, Column 4 Row 5 - Column 4 Row 7, Column 3 Row 5, Column 3


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

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