Statistical Calculations 121
The standard deviations calculated by
\h
and
\h\«
are the sample
standard deviations. They assume that the data is a sampling of a larger, complete set of data.
If the data constitutes the entire population, the true population standard deviations can be
calculated by pressing
\e
and
\e\«
.
Example 3
The coach has four new players on the team with heights of 193, 182, 177, and 185
centimeters and weights of 90, 81, 83, and 77 kilograms. Find the mean and population
standard deviation of both their heights and weights, then sum the
y
-
data.
Linear Regression, Estimation, and Regression Modes
Linear regression is a statistical method for estimation and forecasting. It is used to find a
straight line that best fits a set of
x,y
data. There must be at least two different
x,y
pairs. The
straight line provides a relationship between the
x-
and
y-
variables:
y = mx
+
b
, where
m
is the
slope and
b
is the
y
-intercept.
Table 12-8 Example 3
Keys
Display
Description
\t
STAT CLR
(message flashes briefly,
then disappears)
Clears statistics memory.
JdDÆd:¡
1.00
Enters height and weight of
player 1.
JgGÆgJ¡
2.00
Enters height and weight of
player 2.
JjjÆgD¡
3.00
Enters height and weight of
player 3.
JgVÆjj¡
4.00
Enters height and weight of
player 4.
\k
184.25
Calculates mean of heights (
x
).
\«
82.75
Displays mean of weights (
y
).
\e
5.80
Calculates population standard
deviation for heights (
x
).
\«
4.71
Displays population standard
deviation for weights (
y
).
]U
331.00
Displays the total of the
y
-values.
Summary of Contents for 10bII+
Page 1: ...i HP 10bII Financial Calculator User s Guide HP Part Number NW239 90001 Edition 1 May 2010 ...
Page 3: ...iii HP 10bII Financial Calculator ...
Page 30: ...At a Glance 22 ...
Page 144: ...Statistical Calculations 136 ...
Page 183: ...Warranty Regulatory and Contact Information 9 ...
Page 184: ...Warranty Regulatory and Contact Information 10 ...