HP 50g Calculator  Calculating Single Variable Standard Deviation using the Preprogrammed Features
Introduction
Standard deviation is a statistic that measures the
variability or dispersion of a set of data. It is calculated from the
deviations (distances) between each data value and the sample mean, and
is often represented by the letter ‘s’. The more disperse the data is,
the larger the standard deviation. The standard deviation squared is
called the variance.
Calculating singlevariable statistics
One method for calculating single variable, standard
deviation involves launching one of the preprogrammed statistical
applications by pressing
. Highlight the desired option and press
to select it. Press
to enter data into the columns of the ∑DAT matrix. The procedure is as follows:

Press

Select ‘SingleVar..’ by pressing

Press the

Enter the data in column 1. On the last entry, press

Press

‘Sample’ is a set of numbers, usually taken from a much larger population.

‘Population’ is a set of all numbers, which is the whole population.


Select ‘Sample’ or ‘Population’, then press the

Press

Press the
Example for calculating singlevariable statistics
Below is an example for entering a set of data and
finding the singlevariable statistics results. The example is
calculated in RPN mode, however, it may be calculated in either RPN or
Algebraic mode.

Press

Select ‘SingleVar..’. An input form labeled ‘SINGLEVARIABLE STATISTICS’ is displayed.

Press the

Enter the data below in column 1. In this example, the row numbers appear before each entry to verify the entries. Use the arrow keys to highlight the next field in Column 1 prior to entry, if necessary :Figure : Entering the dataUsing this method for data entry, the data in Column 1 displays as shown in the above figure.

2.1, press

1.2, press

3.1, press

4.5, press

2.3, press

1.1, press

2.3, press

1.5, press

1.6, press

2.2, press

1.2, press

2.5, press


Press

Select ‘Sample’ and then press the

Use the arrow keys to highlight the various fields and the

Mean

Std Dev

Variance

Total

Maximum

Minimum


Press theFigure : Results for Sample statisticsSimilarly, to calculate the results for Population statistics for the same data, at this point, pressFigure : Results for Population statistics