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278
Perform the following key operation from the statistical result screen.
J(To data input screen)
cccccc(To Execute line)
6(DRAW)
uu
uu
u2-Sample Z Test
This test is used when the sample standard deviations for two populations are
known to test the hypothesis that the population means of the two populations are
equal. The 2-Sample Z Test is applied to standard normal distribution.
Z =
o
1
– o
2
σ
n
1
1
2
σ
n
2
2
2
+
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.
3(TEST)
1(Z)
2(2-S)
The following shows the meaning of each item in the case of list data specification.
Data................ data type
µ
1 .................... population mean value test conditions (“G
µ
2” specifies two-
tail test, “<
µ
2” specifies one-tail test where sample 1 is
smaller than sample 2, “>
µ
2” specifies one-tail test where
sample 1 is greater than sample 2.)
σ
1 .................... population standard deviation of sample 1 (
σ
1 > 0)
σ
2 .................... population standard deviation of sample 2 (
σ
2 > 0)
List1................ list whose contents you want to use as sample 1 data
List2................ list whose contents you want to use as sample 2 data
Freq1 .............. frequency of sample 1 (positive integer)
Freq2 .............. frequency of sample 2 (positive integer)
Execute .......... executes a calculation or draws a graph
18 - 6 Tests
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