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Table 6-3 The Curve Fitting Menu
Menu Key
Description
EtIIII
Estimates an x-value based on a y-value or a
y-value based
I11III
on an x-value.
111mB
-
Displays the correlation
coefficient.
The correlation coefficient
is a number between
-1
and
+
1 that measures how closely
the
x,y-values
match the calculated curve.
-
A correlation co-
efficient close to
+
1 or
-
1 indicates that the x,y-values lie
close to the calculated
curve;
a correlation coefficient close to
o
indicates the curve is a poor fit to the values.
-
-
Displays the value of
A
for
the model. (For the linear model,
this
is
the y-intercept of the line.)
-
-
Displays the value of B
for
the model. (For the linear model
,
this is
the slope of the line.)
•
Calculated using the transformed formulas for the exponential, logarithmic,
and
power
models.
Example: Curve fitting. Bolden's
Health Foods
advertises
on a
local
radio station. For
the past
six weeks, the
manager has kept records
of
the number
of
minutes
of advertising
that
were
purchased, and the
sales
for that
week:
Number of Minutes
of Radio Advertising
Dollar Sales
Purchased
(y-Values)
(x-Values)
Week 1
2
$1,400
Week 2
1
$ 920
Week 3
3
$1,100
Week 4
5
$2,265
Week 5
5
$2 ,890
Week 6
4
$2,200
6: Running Total and Statistics Calculations
105
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