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12-4 Statistical Operations
Statistical Calculations
Once you have entered your data, you can use the functions in the statistics menus.
Statistics Menus
Mean
Mean is the arithmetic average of a group of numbers.
Press ( ) for the mean of the x–values.
Press Õ( ) for the mean of the y–values.
Press
ÕÕ() for the weighted mean of the x–values using
the y–values as weights or frequencies. The weights can be integers or non–
integers.
Reenters the first data pair.
There is still a total of two
data pairs in the statistics
registers.
Menu Key Description
L.R.
The linear–regression menu: linear estimation
and curve–fitting . See ''Linear
Regression'' later in this chapter.
,
The mean menu: . See "Mean"
below.
s,σ
The standard–deviation menu: σ σ.
See "Sample Standard Deviation" and
"Population Standard Deviation" later in this
chapter.
SUMS
The summation menu:
. See "Summation Statistics" later in this
chapter.
ˆ
ˆ
x
y