HP 35s, User Manual

Page: 168 / 382

12-2
Statistical Operations
Entering One–Variable Data
1. Press
 
(  )to clear existing statistical data.
2. Key in each x –value and press

.
3. The display shows n , the number of statistical data values now accumulated.
Pressing

actually enters two variables into the statistics registers because the
value already in the Y–register is accumulated as the y –value. For this reason, the
calculator will perform linear regression and show you values based on y even
when you have entered only x –data — or even if you have entered an unequal
number of x –and y –values. No error occurs, but the results are obviously not
meaningful.
To recall a value to the display immediately after it has been entered, press

.
Entering Two–Variable Data
If the data is a pair of variables, enter first the dependent variable (the 2
nd
variable
of the pair) and press

, and then enter the independent variable (the first
variable of the pair) and press

.
1. Press
 
(  ) to clear existing statistical data.
2. Key in the y –value first and press

.
3. Key in the corresponding x –value and press

.
4. The display shows n , the number of statistical data pairs you have
accumulated.
5. Continue entering x , y –pairs. n is updated with each entry.
To recall an x –value to the display immediately after it has been entered, press

.
Correcting Errors in Data Entry
If you make a mistake when entering statistical data, delete the incorrect data and
add the correct data. Even if only one value of an
x , y –pair is incorrect, you must
delete and reenter both values.