Page 59 - 006

53

_
7) O " %_ M$ U M % UI E_ (size of sampling unit)

3

/
1
1
6/
1

/
)

(* " ' ! * 5( ' % H6 ! H 5 %

#
(! *
& #&0 $ ).6%5( " H)

&1 * "

1

/
7
/
7

/
' ! " L ' *
H+ L '&1 ## "K ## (" '

+/
7

7
7
1
7
L '
(& standard error
0 " K ("
3! * '

1
/
1
)
0

/

1
+7
1
+/
'( ! " *
(pre-test) '
* # "'!
0

& %CV "
25% 1 &1 !) ( 7


N =  s  × 2

 ⋅E  x

6/ N &6 *1 " ' /
!0
s &6 & # /" # J
0 " pre-test
E &6 ! (! & standard error
#& 8 /"
0
" ' /
("
% E = 0.05 6 0.1
x &6 & 8 /"
0 " pre-test

" %_

+
/

' # !0 " * ' 5 * ! ' '(
1

%
' 7 ( ("
!0 " pre-test ' 7 ( 4
0 "
5( $ ).6% "
!0 ( 7 &6 21, 57, 23 38

0 " pre-test
& 8 /" x = 34.75
# /" # J ( ) s = 16.66
sx
standard error ( ) = 8.33
sx

%CV = × 100 %= 24.0% +/ & "
25% !( ! H
x
% &1 & N 5( 5 ("


N =  s  × 2

 ⋅E  x
=  66 . 16  × 2


05 . 0  × 75 . 34 
= 18 . 19
≈ 20