User Manual

11
© 2006 TEXAS INSTRUMENTS INCORPORATED TI-30XS MultiView: A Guide For Teachers 83
Statistics
Keys
1. v lets you enter data points ( x for 1-Var
stats; x and y for 2-Var stats). (See Chapter
10, Data editor and list formulas, for more
details on v.)
2. %t displays a menu from which you can
select 1-Var, 2-Var or StatVars.
1-Var Analyzes data from 1 set of data
with 1 measured variable—x.
2-Var Analyzes paired data from 2 sets
of data with 2 measured
variables—x, the independent
variable, and y, the dependent
variable.
StatVars This option appears only after you
have calculated 1-var or 2-var
stats. Displays the menu of
variables with their current values.
StatVars menu:
n Number of x (or x,y) data
points.
v or w Mean of all x or y values.
Sx or Sy Sample standard deviation of x
or y.
sx or sy Population standard deviation
of x or y.
Gx or Gy Sum of all x values or y values.
Gx
2
or Gy
2
Sum of all x
2
values or y
2
values.
Gxy Sum of the product of x and y
for all x-y pairs in the 2 lists.
a Linear regression slope.
b Linear regression y-intercept.
r Correlation coefficient.
x Å
ÅÅ
Å (2-var) Uses a and b to calculate
predicted x value when you input
a y value.
y Å
ÅÅ
Å (2-var) Uses a and b to calculate
predicted y value when you
input an x value.
minX Minimum of x values.
Q1 (1-var) Median of the elements
between minX and Med (1st
quartile).
Med Median of all data points.
Q3 (1-var) Median of the elements
between Med and maxX (3rd
quartile).
maxX Maximum of x values.
Notes
• The examples on the transparency masters
assume all default settings.
• You can change data points by going to the
Data editor, navigating to the data element,
and changing the value entered.
Note: You must then recalculate 1-var or
2-var stats to display the StatVars option.
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