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Copyright © 2006 Texas Instruments Incorporated 31
If Sydney, Australia is 21ÄC, find the temperature in degrees
Fahrenheit.
Statistics
% t v
% t displays a menu with the following options:
1-Var Stats analyzes statistical data from 1 data set with 1
measured variable, x.
2-Var Stats analyzes paired data from 2 data sets with 2
measured variables—x, the independent variable, and y,
the dependent variable.
StatVars displays a secondary menu of statistical
variables. The StatVars menu only appears after you have
calculated 1-Var or 2-Var stats. Use $ and # to locate
the desired variable, and press < to select it.
!$$$21 <
Variables Definition
n Number of x or (x,y) data points.
Ï or Ð Mean of all x or y values.
Sx or Sy Sample standard deviation of x or y.
Îx or Îy Population standard deviation of x or y.
Òx or Òy Sum of all x or y values.
Òx
2
or Òy
2
Sum of all x
2
or y
2
values.
Òxy Sum of (xy) for all xy pairs.
a Linear regression slope.
b Linear regression y-intercept.
r Correlation coefficient.
xÅ (2-Var) Uses a and b to calculate predicted x
value when you input a y value.
31


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