Math IA

25

.

290

25

.

992

-

20

25650

2

2

2

=

=

-

=

å

x

n

x

Sx

)

(

2

x

x

Sx

Sxy

y

y

-

=

-

)

5

.

31

25

.

290

9

.

211

9

.

73

-

=

-

x

y

（

)

5

.

31

(

7300602929

.

0

9

.

73

-

=

-

x

y

9

.

73

995

.

22

730

.

0

+

-

=

x

y

905

.

50

730

.

0

+

=

x

y

905

.

50

730

.

0

+

=

x

y

905

.

50

)

65

(

730

.

0

+

=

S

355

.

98

=

S

)

(

2

x

x

Sy

Sxy

y

y

-

=

-

9

.

211

85

.

2327

75

.

2539

9

.

73

*

5

.

31

20

50765

=

-

=

-

=

-

=

å

）

（

y

x

n

xy

Sxy