Casio CFX-9850G PLUS, User'S Manual & Technical Reference

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Perform the following key operations from the statistical result screen.
J
(To data input screen)
cccccc
(To Execute line)
6
(DRAW)
u u
u u u
2-Sample Z Test
This test is used when the sample standard deviations for two populations are
known to test the hypothesis. The
2-Sample
Z
Test is applied to the normal
distribution.
Z
=
o
1
–
o
2
σ
n
1
1
2
σ
n
2
2
2
+
o
1
: sample 1 mean
o
2
: sample 2 mean
σ
1
: population standard deviation of sample 1
σ
2
: population standard deviation of sample 2
n
1
: sample 1 size
n
2
: sample 2 size
Perform the following key operations 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
Freq2 .............. frequency of sample 2
Execute .......... executes a calculation or draws a graph
Tests
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