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20010101
After setting all the parameters, align the cursor with [Execute] and then press the function
key shown below to perform the calculation.
• 1(CALC) ... Performs the calculation.
Calculation Result Output Example
Left .............................. interval lower limit (left edge)
Right ............................ interval upper limit (right edge)
o .................................. mean of sample
x
σ
n-1 ............................. sample standard deviation
(Displayed only for Data: List setting.)
n .................................. size of sample
uu
uu
u 2-Sample Z Interval
2-Sample Z Interval calculates the confidence interval for the difference between two
population means when the population standard deviations of two samples are known.
The following is the confidence interval. The value 100 (1 –
α) % is the confidence level.
Left = (o
1
– o
2
) – Z
α
2
Right = (o
1
– o
2
) + Z
α
2
n
1
1
2
σ
+
n
2
2
2
σ
n
1
1
2
σ
+
n
2
2
2
σ
o1 :mean of sample 1
o2 :mean of sample 2
σ
1: population standard deviation
of sample 1
σ
2: population standard deviation
of sample 2
n1 :size of sample 1
n2 :size of sample 2
Perform the following key operations from the statistical data list.
4(INTR)
b(Z)
c(2-Smpl)
1-3-4
Confidence Interval (INTR)
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