HP 30b Professional, 20b Consultant Financial manual ax +bx+c

Table 12-1 The Statistics Menu Items

Menu Item	Description
y Std. Dev	Standard deviation for y: a measure of how dispersed the y data values are about
	the mean.
x Population Dev	Population Standard deviation for x: a measure of how dispersed the x data values
	are about the mean, assuming the data constitutes a complete set of data.
y Population Dev	Population Standard deviation for y: a measure of how dispersed the y data values
	are about the mean, assuming the data constitutes a complete set of data.
S.E.Samp.x	Standard error for the sample x: a measure of the dispersion of x mean, assuming
	the data is a sampling of a large, more complete data set.
S.E.Samp.y	Standard error for the sample y: a measure of the dispersion of y mean, assuming
	the data is a sampling of a large, more complete data set.

Pred x

Pred y

Predicts x for a given hypothetical value of y, based upon the model calculated to fit the data.

Predicts y for a given hypothetical value of x, based upon the model calculated to fit the data.

a		The a coefficient for the chosen regression model, which is the slope for a linear
		model.
b		The b coefficient for the chosen regression model, which is the y-intercept for a linear
		model.
c		The	c	coefficient for the chosen regression model, applies only for	2	.
					ax +bx+c
Correlation		The correlation coefficient for the given (x, y) data. The correlation coefficient is a
		number in the range -1 through 1 that measures how closely the calculated line fits
		the data.
Covariance		A measure of how much two variables change in relation to one another.
Σx		The sum of the x values.
Σy		The sum of the y values.
Σx2		The sum of the squares of the x values.
Σy	2	The sum of the squares for the y values.
Σxy		The sum of the products of the x and y values.
Quartiles*		The boundaries of a given frequency distribution divided into four parts.
Median*		The middle value in a given frequency distribution.
Maximum*		The largest value in a given frequency distribution.
Minimum*		The lowest value in a given frequency distribution.

*Does not apply to the HP 20b.

Statistical Operations 71