HP 33s Scientific manual Entering One-Variable Data, Entering Two-Variable Data

Entering One–Variable Data

1.Press {c{Σ} 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

In RPN mode, when your data consist of two variables, x is the independent variable and y is the dependent variable. Remember to enter an (x, y) pair in reverse order (y ‘ x) so that y ends up in the Y–register and X in the X–register.

1.Press {c{Σ} 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.

To correct statistical data:

11–2Statistical Operations