Texas Instruments TI-73 Explorer - Page 142

136
Chapter 7: Statistical Analyses
7307ENG.DOC CH 7, Statistical Analyses, English Julie Hewlett Revised: 07/29/98 12:07 PM Printed: 05/19/99
9:00 AM Page 136 of 22
What Do the Results Mean?
1-Var Stats
and
2-Var Stats
variables are calculated and stored as
indicated below. To access these variables for use in
expressions, press - }
3:Statistics
and select the
appropriate menu. If you edit a list or change the type of
analysis, all statistical variables are cleared.
Variables Definition VARS Menu
x
or
y
Mean of all
x
or
y
values.
XY
Gx
or
Gy
Sum of all
x
values or
y
values.
G
Gx
2
or
Gy
2
Sum of all
x
2
values or
y
2
values.
G
Sx
or
Sy
Sample standard deviation of
x
or
y.
XY
sx
or
sy
Population standard deviation
of
x
or
y.
XY
n
Number of
x
or
x
,
y
data points.
XY
minX
minY
Minimum of
x
values or
y
values.
XY
maxX
maxY
Maximum of
x
values or
y
values.
XY
Gxy
Sum of
x
¦
y
for all
xy
pairs in
two lists.
G
Q
1
Median of the elements
between
minX
and
Med
(1st
quartile). Only calculated for
1-Var Stats
.
PTS
Med
Median of all data points.
PTS
Q
3
Median of the elements
between
Med
and
maxX
(3rd
quartile). Only calculated for
1-Var Stats
.
PTS