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HP 20B User Manual

HP 20B
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Statistical Operations
62
Table 10-1 The Statistics Menu Items
Menu Item Description
Nb Item
Number of items.
X
Mean
Average of X values.
Y
Mean
Average of Y values.
X Std. Dev Standard deviation for X: a measure of how dispersed the x data values are
about the mean.
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 Sample error for X: a measure of how dispersed the X data values are about
the mean sample standard deviation, assuming the data is a sampling of a
larger, more complete data set.
S.E.SamP.Y Sample error for Y: a measure of how dispersed the Y data values are about
the mean sample standard deviation, assuming the data is a sampling of a
larger, more complete data set.
Pred X Predicts X for a given hypothetical value of Y, based upon the model calculated
to fit the data.
Pred Y 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.
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.
Sigma X The sum of the x values.

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HP 20B Specifications

General IconGeneral
TypeFinancial
Cover-
Form factorPocket
Control typeButtons
Product colorBlack
Digits12 digits
Display typeLCD
Display tiltingNo
Display number of lines2 lines
Battery typeCR2032
Power sourceBattery
Auto power offYes
Number of batteries supported2
Memory registers110
Weight and Dimensions IconWeight and Dimensions
Depth149.2 mm
Width77 mm
Height16 mm
Weight37.5 g

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