Casio fx-9750G PLUS - Manual (Page 307)

279
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
18 - 6