HP 20b Consultant Financial, 30b Professional manual The Data and Stats Menus

The Data and Stats Menus

Statistics analysis functions are located in the Data and Statistics menus accessible with the :yand :zkeys. See Figure 1 for assistance with navigating through the menus.

Press :yto open the Data menu. In this menu, enter a list of x values for one-variable statistics, a list of pairs, (x, F) for one-variable statistics with frequency, or a list of pairs, (x, y)

for two-variable statistics. To enter data, key in a number and press I.

Press :zto analyze the data. If you attempt to open the Statistics (Stats) menu before entering data, you will be redirected to the Data menu. When opened, the Stats menu

displays 2 Vars for two-variable statistics. Press Irepeatedly to select the type of

statistical operations desired, two-variable, (2 Vars), one-variable, (1 Var), or one-variable with frequency (1 Freq).

After selecting the type of statistical operation you want, select a sub-menu by pressing <

or >, and press Ito open it. Once in a sub-menu, press <or > repeatedly to view the results. To return from the sub-menu to the Statistics menu, press

:z.

NOTE: in one-variable modes, there are no items for y, and the Predictions sub-menu is not available.

Pressing Iwith the Predictions sub-menu displayed opens a sub-menu, in which you can choose among seven different types of regression lines. See Figure 1. To select a specific type of regression line in the Predictions sub-menu, press Ito cycle through the options.

NOTE: if you press =, the calculator automatically selects the curve that is the best fit for your data.

Once you select a regression line, press <to see the regression line parameters and perform predictions.

Table 12-1 The Statistics Menu Items

Menu Item			Description
Nb Item			Number of items.
		Mean	Average of x values.
	X
			Average of y values.
Y Mean
x Std. Dev			Standard deviation for x: a measure of how dispersed the x data values are about
			the mean.

70 Statistical Operations