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295
Example To calculate the 1-Sample Z Interval for one list of data
For this example, we will obtain the
Z Interval for the data
{11.2, 10.9, 12.5, 11.3, 11.7}, when C-Level = 0.95 (95% confi-
dence level) and
σ
= 3.
1(List)c
a.jfw
dw
1(List1)c1(1)c1(CALC)
Left ................. interval lower limit (left edge)
Right............... interval upper limit (right edge)
o ..................... sample mean
x
σ
n-1 ................ sample standard deviation
n ..................... sample size
uu
uu
u2-Sample Z Interval
2-Sample Z Interval calculates the confidence interval when the standard
deviations of two samples are known.
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 : sample 1 mean
o2 : sample 2 mean
σ
1: population standard deviation
of sample 1
σ
2: population standard deviation
of sample 2
n1 : sample 1 size
n2 : sample 2 size
Perform the following key operation from the statistical data list.
4(INTR)
1(Z)
2(2-S)
The following shows the meaning of each item in the case of list data specifica-
tion.
Data................ data type
C-Level........... confidence level (0 < C-Level < 1)
Confidence Interval 18 - 7
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