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X = y -
Estimated value (the value of x is estimated from that o f y .)
u
y
y' = a + b x
Estimated value (the value of y is estimated from that of x .)
® Data fo r two-variable statistic calculations are inputted by the following operations.
(1)
Data ix )
Data iy )
[
daw
]
(2)
Data (x)
Data (y ) [X ]
Frequency
[
daw
]
Example:
If we know a student's mark in mathematics, can we predict the mark if1
English?
The exam marks fo r six students chosen at random are given in the following
table:
Mode: STAT, Floating decimal point system
Student No.
n
Mark in Math.
X
Mark in English
Y
1
82
79
2
53
50
3
61
87
4
74
96
5
51
73
6
51
73
Key in:
Display
82
79
[
daw
]
1
53
s
50
[
d a w
]
2
61
87
[
d a t a
]
3
74
s
96
|
d aw
]
4
51
73 x 2 [
d aw
]
6
(Note: to input multiple identical
s
i s
.571587901
samples proceed as indicated)
s
34.26190476
s
t s
.678571429
value of
r
of .57 indicates that the correlation is marginal.
The equation fo r the
straight line fo r this data is Y = 34.26 + .68X.
' we had a student whose mark in mathematics was 90, based on this analysis, what mark
^ould the student have in English?
90 (2 n d F l [ y ]
95.33333333
If we had a student whose mark in English was 80, based on this analysis, what mark would
student have in mathematics?
80 0
0
67.40350877
47
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