Sharp PC-1403 - Page 44

38
Di s p la y
1 .
2.
3 .
4 .
6. ( N ote : To i n put m ulti p l e
i de nti ca l sa mple s , pro -
ceed as i nd icat ed . )
79
so
87
96
73
73
y
Stud e nt No.
Ma r k i n Mat h .
ll x
82
2
53
3
61
4 74
5
5 1
6
51
K ey i n :
82
@
79
@ill]
53 ~
50
~
61
@
87
@ill]
7 4 ~
9 6
@ill]
5 1
~
7 3
00
2 @mi
E xam p l e 1 : I f we know a student's m ar k i n mathem a t i cs , can we predi c t the mark in
E n gl i sh?
T h e e xa m m ar ks for fiv e stud en ts chose n at r a n do m a r e g ive n i n th e follow i ng ta b l e :
M ark i n E ngl i s h
S = Lx 2 - (Lx)2
xx n
(I; y) 2
S y y = L Y2 -- - -
n
.l:x· 1:y
S xy = LX y - ~ - --
n
a :
a = ji - b i
l
C oeff icient of li near
b :
b=
S xy
r eg r essi on eq u ati o n
S xx
y = a+ bx
r : Cor r e l at i on coeffic i e n t
S x y
r = --;:::= === =-
.../ Sxx . S yy
Neg a t i v e
C o rre l at i o n
Pos i t i ve
Co rr el a tion
U sing a s a C a l culat o r
Valu e of r Ca ll i t
+ 0 . 80 t o + 1. 00
E xt r a H i gh
+0 . 60 t o + 0 . 80
Hi gh
+ 0.40 t o + 0 . 6 0 Mode ra te
+ 0 .2 0 to + 0.4 0 Low
- 0 .2 0 t o + 0 . 20 N il
- 0 . 2 0 to -0 .40 L ow
- 0 .40 to -0.6 0 M ode r a te
- 0 . 60 t o - 0 .8 0
Hi gh
- 0 . BO t o - 1 . 00
E xt r a H ig h