66
<Example 6>
The hot water inside an electric pot is maintained at 92 C.
When a thermometer is placed in this hot water, the values indicated by the
thermometer at times x and the differences y between these values and the
temperature of the hot water are shown below. Using Euler's exponential
regression, find the formula that expresses the relation between each time x
and the temperature difference y.
Operation
0
67
4
40
...
37
1
Temperature difference y [ C] from liquid
(Room temperature 25 C, hot water temperature 92 C)
Time x [S] Thermometer temperature [ C]
0
4
8
12
16
20
24
28
32
36
40
25
55
71
79
85
88
90
90
91
91
91
67
37
21
13
7
4
2
2
1
1
1
e: Napier's constant
e=2.718281828…
Display
When x and y are in the following relationship, use Euler's exponential regression to find the
coefficients a and b of the relational expression y = ae
bx
, and the correlation coefficient r.
0
x
y
4
8
12
16
20
24
28
32
36
40
67
37
21
13
7
4
2
2
1
1
1
Correlation coefficient
r 1
Correlation exists
Fig. 1
Fig. 2
Fig. 3
Correlation exists
No correlation
r -1
r = 0
y
x
x x
x x
x x
x x
x
x
x x x
x x
x xx
x x
x
x
x
x
x x
x
x
x
x
x
x
x
x
y
y
DATA
DATA
(Close the input table.)
STAT
Summary of Contents for EL-W516T
Page 1: ...SCIENTIFIC CALCULATOR OPERATION GUIDE SCIENTIFIC CALCULATOR OPERATION GUIDE EL W535TG W516T ...
Page 32: ...32 Example Operation Absolute Value Returns an absolute value Display 3 4 ...
Page 35: ...35 20 30 20 17 2 30 17 2 Trigonometric Functions ...
Page 37: ...37 4 8 12 16 Trigonometric Functions ...
Page 48: ...48 3 10 20 3000 x Integration calculation dx x x 100 0 dx ...