Linear Regression And Estimation - HP -22S Owner's Manual

Example: Population Standard Deviation. Grandma Hindde has
four grown sons with heights of 170, 173, 174, and 180 em. Find the
mean and standard deviations of their heights.
Keys:
. , CLEAR
I
{I}
170 ,
~+
I
173 ,
~+
I
174
,~+
1180
,~+
I
, STAT I
{iiC,y} {iiC}
,
~+I
'STATI
{s} {s,,}
Display:
n=4.eeee
;<=174.25121121
n=5.eeee
s><=3.6315
Linear Regression and Estimation
Description:
Clears the statistics
registers.
Enters the data.
Calculates the mean.
Adds the mean to the
data.
Calculates the popula-
tion standard
deviation.
Linear regression is a statistical method for finding a straight line that
best fits a set of x,y-data. There must be at least two x,y-pairs. The
straight line provides a relationship between the
x-
and y-variables.
Linear Regression. To do a linear regression calculation:
1. Enter the x,y-data using the instructions on page 61.
2. Press'
STAT I,
then {loR.}.
3. Press:
• {r}
to calculate the correlation coefficient.
• {m}
to calculate the slope of the line.
• {b}
to calculate the y-intercept.
The straight line calculated by linear regression can be used to esti-
mate a y-value for a given x-value, or vice versa.
5: Statistical Calculations 65