Web.mit.edu

[Pages:8]

# #$

# (

&

( !

# ! * !

+

#

,

#

'

(x )2

2 =

n

s2&

x2

2 =

2

n

#'

(x x)2

s2 =

x2 ( x)2

s2 =

n

n 1

n 1

* ! +

s

) $

"!

% s n

!! %

s2

1

+

1

&

s12 + s22

n1 n2

n1 n2

!"!%" " '!" #"#"! " !$#

#'"!!243+!""!"""#"!#"!$#243

" "$'"!!23+!""!"""!"#1! " "1!!!"4

"-!""!"+!" (!" "% 4

t

=

x

0 s

! 23>

n

"""-!" #" "$#! "-$#2 "'"""!%!"'

$4!"#"3#!"#""-!""!" ! , +A4""-!""!"!'!"$* "!$ +@4""-!""!"!'"$*""-!" #"!!'" ! " "'!""-

!""!"% !"$

"+""-!""!"!"/% 0!)"-$#!5#!"$" "

+?4 "-$#!""-!""!"% !"$#"2"! "!!" " "3

"-$#!!!"" " $# !2!#!#'4,493) ""# '"!!""" "$'"!!,

+ # & !!!! """"#!!#"&"',#" !# "!#$!'# "%" ' %,# !#"! $%,

&#""$ ! %" !4,491,!"!#$'# "%" &

""2!!#>4,493.

' # 1

4+>4,49*+A4,49 #""!" $"'# !+

5

4,495

6

4,4949

7

4,48=

8

4,495:

x = 0.0508

s2 =

(x x)2 n 1

=

(0.051 0.0508)2

+ (0.0505 0.0508)2 6

+

etc...

=

9.15 107

9

4,496

:

4,494<

s = s2 = 9.56 104

;

4,494:

"-!""!"!+ t

=

x

0 s

=

0.0508 0.05 9.56 104

= 2.17"

!

>;-5>:

n

7

"""-!" #" "$#!")6,5;%": ! !"%4,49>4,469,

!!"""-$#!!!"4,49)!'# "4#"""!#$'# " %" &!"",

!"!%" "!"%#"! !"' " "

$# # !! "'"$#"" #*+ " $#!" #

" "" $#""

#" """%$#! $#""!"$#!2" !3#!

4>4" -!"-"!"

"%#"! "

4+!""!"""!""%#"! #25>63

+!""!"""!""%#"! ## ! " """ 25?6)5A6)5@63

!+ !! !)

""# ) t =

x1 x2 """# ) t =

s2

1

+

1

n1 n2

x1 x2

s12

+

s22

n1 n2

;.1+1/:.2+1/

!!!+ !"!!#" !+#"" !"!!+ !! !

*

!! !!+ !! !. "!!! /!

"!+#"1 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download