HP 10B, Руководство

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Hewlett-Packard 10B Tutorial
Page 11
Statistical Calculations
The HP can also be used for several types of statistical calculations.
Mean and Standard Deviation (
F
)
Year Sales
1994 $150
1995 95
1996 260
What’s the mean (average) and standard deviation (
F
) of sales over the 3 years?
Use the
E
+ key to enter data:
CLEAR ALL
150 A number 1 is displayed.
E
+
95 A number 2 is displayed.
E
+
260 A number 3 is displayed.
E
+
Determine the mean and standard deviation by simply pressing
_ _
The mean equals $168.33.
x, y
The standard deviation is $84.01. and are sample standard
S
x
, S
y
deviations.
F
x
and
F
y
refer to population statistics.
Linear Regression
Beta coefficients can be calculated by using the HP’s linear regression capabilities. The X (independent
variable) and Y (dependent variable) values must be entered in the proper sequence, where the X data is
on the horizontal axis (
market ) and Y data is on the vertical axis ( stock ).
Year Market (k
M
) Stock (k
j
)
____ __________ ________
1 23.8% 38.6%
2 -7.2 -24.7
3 6.6 12.3
4 20.5 8.2