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¯ x 1 .................................mean of sample 1
x 1
σ
n -1 ............................ standard deviation ( x 1
σ
n -1 > 0) of sample 1
n 1 ................................. size (positive integer) of sample 1
¯ x 2 .................................mean of sample 2
x 2
σ
n -1 ............................ standard deviation ( x 2
σ
n -1 > 0) of sample 2
n 2 ................................. 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
¯ x 1 .................................mean of sample 1
¯ x 2 .................................mean of sample 2
x 1
σ
n -1 ............................ standard deviation of sample 1
x 2
σ
n -1 ............................ standard deviation of sample 2
x p
σ
n -1 ............................ pooled sample standard deviation
(Displayed only when Pooled: On setting.)
n 1 ................................. size of sample 1
n 2 ................................. size of sample 2
6-6-11
Confi dence Interval