(a)
To find: The scatter graph of given data.
The graph is given
Given information:
Time(min) | Temperature | Time (L2) | Temperature |
1 | 184.3 | 11 | 140 |
2 | 178.5 | 12 | 136.1 |
3 | 173.5 | 13 | 133.5 |
4 | 168.6 | 14 | 130.5 |
5 | 164.0 | 15 | 127.9 |
6 | 159.2 | 16 | 125 |
7 | 155.1 | 17 | 122.8 |
8 | 151.8 | 18 | 119.9 |
9 | 147 | 19 | 117.2 |
10 | 143.7 | 20 | 115.2 |
Graph of time from L1 and temperature from L2 is given below.
(b)
To find: Store L2-72 and find L3.
The table is given
Given information:
L3 Time | temperature |
21 | 68 |
22 | 64.1 |
23 | 61.5 |
24 | 68.5 |
25 | 55.9 |
26 | 53 |
27 | 50.8 |
28 | 47.9 |
29 | 45.2 |
30 | 43.2 |
(c)
To find: Find the exponential regression for L3.
The exponential regression for L3 is y=73.71⋅(0.9485)x
Given information:
L3 Time | temperature |
21 | 68 |
22 | 64.1 |
23 | 61.5 |
24 | 68.5 |
25 | 55.9 |
26 | 53 |
27 | 50.8 |
28 | 47.9 |
29 | 45.2 |
30 | 43.2 |
The curve to be fitted is y=abx taking logarithm on both sides, we get
log10(y)=log10(a)+xlog10(b)
y=a+bx where Y=log10(y), A=log10(a),B=log10(b)
which linear in Y,x
So the corresponding normal equations are
∑Y=nA+B∑x
∑xY=A∑x+B∑x2
The values are calculated using the following table
x | y | Y=log10(y) | x2 | x·Y |
1 | 68 | 1.8325 | 1 | 1.8325 |
2 | 64.1 | 1.8069 | 4 | 3.6137 |
3 | 61.5 | 1.7889 | 9 | 5.3666 |
4 | 68.5 | 1.8357 | 16 | 7.3428 |
5 | 55.9 | 1.7474 | 25 | 8.7371 |
6 | 53 | 1.7243 | 36 | 10.3457 |
7 | 50.8 | 1.7059 | 49 | 11.941 |
8 | 47.9 | 1.6803 | 64 | 13.4427 |
9 | 45.2 | 1.6551 | 81 | 14.8962 |
10 | 43.2 | 1.6355 | 100 | 16.3548 |
--- | --- | --- | --- | --- |
∑x=55 | ∑y=558.1 | ∑Y=17.4124 | ∑x2=385 | ∑x· Y=93.8731 |
Substituting these values in the normal equations
10A+55B=17.4124
55A+385B=93.8731
Use elimination method we obtain A=1.8676,B=-0.023
∴a=antilog10(A)=antilog10(1.8676)=73.7191 and b=antilog10(B)=antilog10(-0.023)=0.9485
Now substituting this values in the equation is y=abx , we get y=73.71⋅(0.9485)x
Chapter 1 Solutions
Precalculus: Graphical, Numerical, Algebraic Common Core 10th Edition
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