20070201
¯x1 ................................. mean of sample 1
x1
σ
n-1 ............................ standard deviation ( x1
σ
n-1 > 0) of sample 1
n1 ................................. size (positive integer) of sample 1
¯x2 ................................. mean of sample 2
x2
σ
n-1 ............................ standard deviation ( x2
σ
n-1 > 0) of sample 2
n2 ................................. size (positive integer) of sample 2
After setting all the parameters, use c to move the highlighting to “Execute” and then press
the function key shown below to perform the calculation.
• 1(CALC) ... Performs the calculation.
Calculation Result Output Example
Left ...............................confi dence interval lower limit (left edge)
Right .............................confi dence interval upper limit (right edge)
df ................................. degrees of freedom
¯x1 ................................. mean of sample 1
¯x2 ................................. mean of sample 2
x1
σ
n-1 ............................ standard deviation of sample 1
x2
σ
n-1 ............................ standard deviation of sample 2
xp
σ
n-1 ............................ pooled sample standard deviation
(Displayed only when Pooled: On setting.)
n1 ................................. size of sample 1
n2 ................................. size of sample 2
6-6-11
Confi dence Interval
