The position of the graphically represented keys can be found by moving your mouse on top of the graphic. The function keys do not count as a row.

 Turn your calculator on Press . Clearing the memory Press .  Select item to delete (use arrow keys to find).  Press (for purge).

 Entering data one variable Push (this puts you in STAT mode; the word STAT is above ).  You will see a menu.  The word single-var is highlighted.  Press .  Press the white key A (it's leftmost on top).  You will see a matrix.  For simplicity, use the first column to enter the values.  Type over any values already there.  Type in the first number, followed by .  Type in second number, followed by .  Continue until all the data have been entered.  Press after the last number in the data set (the second ENTER indicates the data set is complete). two variables Push (this puts you in STAT mode).  You will see a menu.  The word single-var is highlighted.  Press   to Fit data... .  Press .  Press the white key A (it's leftmost on top).  You will see a matrix.  For simplicity, use the first column to enter the x-values, the second column for the y-values.  Type over any values already there.  Type in the first x-value, followed by .  Type in second x-value, followed by .   Continue until you have entered all the x-values in the first column.  Press after the last x-value.  Now press ... until you are at the top of the second column.  Enter the first y-value, then press and continue until you have entered all of the y-values.  Make sure the y-values line up with the corresponding x-values.   Press after the last y-value in the data set (the second ENTER indicates that the data set is complete).

 Calculating one-variable statistics mean (x) If you just entered the data, you should be in the right place.  If not, press (gets you into stat mode). You should see a list of six options.  Arrow over to mean, and press the white key C (middle key of the top row of white keys).  You can also choose standard deviation at this point.  Press . standard deviation for populations (s or sn) If you just entered the data, you should be in the right place.  If not, press (gets you into stat mode).  You should see a list of six options.  Arrow over to st dev, and press the white key C (middle key of the top row of white keys).  Right above the six choices you should see the word population.  If you see the word sample instead, arrow up to it and press white key B.  You'll see a menu.  Arrow down to population, and press .  You can also choose mean at this point.  Press . standard deviation for samples (s or sn-1) If you just entered the data, you should be in the right place.  If not, press (gets you into stat mode).  You should see a list of six options.  Arrow over to st dev, and press the white key C (middle key of the top row of white keys).   Right above the six choices you should see the word sample.  If you see the word population instead, arrow up to it and press white key B.  You'll see a menu.  Arrow up to sample, and press .  You can also choose mean at this point.  Press .

 Calculating two-variable statistics r (correlation) If you just entered the data, you should be in the right place.  If not, press (gets you into stat mode).  Press the white key F (rightmost key of the top row of white keys).  Press . regression coefficients slope If you just entered the data, you should be in the right place.  If not, press (gets you into stat mode).  Press the white key F (rightmost key of the top row of white keys).  Press .  The HP-48G gives you the whole regression line. The slope is the coefficient on the x term. y-intercept If you just entered the data, you should be in the right place.  If not, press (gets you into stat mode).  Press the white key F (rightmost key of the top row of white keys).  Press .  The HP-48G gives you the whole regression line. The y-intercept is the term without the x.

 Calculating combinations and permutations combinations (nCr) Enter the n value,  ,  the r value, and  again.  (Yes, HPs use Reverse Polish Notation.)  Press , followed by white key A.  (There will be a row of words on the bottom of the screen.  PROB will be the first.) Press white key A again (COMB is the first word on the bottom of the screen.) permutations (nPr) Enter the n value,  ,  the r value, and  again.  (Yes, HPs use Reverse Polish Notation.)  Press  , followed by white key A.  (There will be a row of words on the bottom of the screen.  PROB will be the first.) Press white key B (PERM is the second word on the bottom of the screen.)

 Turning the calculator off Press and the calculator will turn off.

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 2: Enter the data (STAT) white key A 3: Compute the mean white key C 4: Compute the population standard deviation. white key C 5: Compute the sample standard deviation: white key C

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: Clear Memory 2: Enter the data (STAT) white key A 3: Compute slope of regression line ( , if necessary) white key F 4: Compute y-intercept of regression line ( , if necessary) white key F 5:Compute the slope of the regression line: ( , if necessary) white key F

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 white key A, white key  A 2: Compute 9P5 white key A, white key B

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

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