Variables
Used:
B
M
R
X
Regression coefficient (y-intercept of a straight
line); also
used
for scratch.
Regression coefficient (slope of a straight line).
Correlation
coefficient;
also
used
for
scratch.
The x-value of a data pair when entering data;
the hypothetical x when projecting y; or x
(x-estimate)
when
given a hypothetical y.
The y-value of a data pair when entering data;
the hypothetical y when projecting x; or y
(y-estimate) when given a hypothetical x.
Index variable used to indirectly address the cor
rect x-, y-projection equation.
Statistical accumulation
and
computation.
Statistics registers
Example 1. Fit a straight line to the data
below.
Make an intentional
error when keyingin the third data pair and correct it with the undo
routine. Also, estimate y for an x value of 37. Estimate x for a y value
of
101.
Keys:
fXEQl S
40.5
fRTS
X
40.5
38.6 37.9
36.2
35.1
34.6
Y
104.5
102
100
97.5
95.5
94
104.5
fRTsl
Display:
Description:
X?
1.0000
Starts straight-line
routine.
Y?
value
Enters
x-value
of
data
pair.
X72.0000
Enters y-value of data
pair.
212
13:
Statistics
Programs
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