Symb – HP 38g Graphing Calculator User Manual
Page 110
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Find the mean advertising time (MEANX), the mean sales
(MEANY), and the correlation coefficient (CORK) for the data
fitting a straight line. The CORK value indicates how well the
linear model fits the data.
rNDKTI {{STATS}}
Displays computed statistics.
MEANX is about 3.3 minutes
and MEANY is about $1796.
Scroll down to display CORE.
CORE is 0.8995 to four
significant digits.
{{OK}}
■ {SETUP-PLOT] 00
{{CHOOS}} 0 {{OK}}
This makes the mark for SI
more visible.
m
[VIEWS]
Select
Auto Scale {{OK}}
(//■{{FIT«}}
is on, the
regression line also appears.)
a-vflftSI
MEANS
IK
IKS
MEflNV
lY
lYE
rpim
BO
17B5.B33
10775
iE53B7S5
3.33333333333
E-VflR
SI
IKE
MEflNV
IV
IVE
IKV
CDRR
BO
17<15.B33
10775
EE33B7ES
NlSqS
,899530938561
STATISTICS FLDT SETUP
KRN6:
-2
24
VRNG:
-2
10.6
SIMAR&H SeMARK; * S3HARK!
4.
SHMARK:;; SBMARKiK
CHOUSE MARK FDR SCATTER PLOT
To find the regression curve (a curve to fit the data points)
and regression values, set
{{FIT«}}
on, if it is not already.
{{MENU}} {{FIT}}
This draws the regression line
for the best linear fit
SYMB
Values for m and b are
substituted into the regression
expression for the Fitl field.
STATISTICS SVMROLIC VIEW
C2
V' F i 11: 425.875»X+376.„
S2:
Fit2:n*X+b
¥
ENTER INDEPENDENT
iHiiiiBiranEi
5-4 Statistics