Homework Answers
( a ) scatter diagram
( b )
There is negative linear relationship between the two variables
( c )
( d )
( e )
when x = 10 then
y = 68 - 3 ( 10 )
y = 68 - 30
y = 38
| x | y | x -x bar | y - y bar | ( x -x bar )( y - y bar ) | ( x - x bar )^2 |
| 3 | 55 | -8 | 20 | -160 | 64 |
| 12 | 40 | 1 | 5 | 5 | 1 |
| 6 | 55 | -5 | 20 | -100 | 25 |
| 20 | 10 | 9 | -25 | -225 | 81 |
| 14 | 15 | 3 | -20 | -60 | 9 |
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1
2
3
4
5
yi
3
8
4
10
15
(a)
Develop a scatter diagram for these data.
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y.
xi
3
12
6
20
14
yi
50
45
55
15
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(d) Develop the estimated regression equation by computing the
values of b0 and b1 using b1 =
Σ(xi − x)(yi − y)
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ŷ =
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Given are five observations for two variables, x and
y.
xi
1
2
3
4
5
yi
3
8
4
10
15
(a)
Develop a scatter diagram for these data.
1 2 3 4 5 g 2 N to Go 4 1 2 0 1 3 4 5 6 1 2 3 (b) What does the scatter diagram developed in part (a) indicate about the relationship between the two variables? There appears to be a negative linear relationship between x...
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Can you please answers these four questions as aoin as
possible please and thank you!
Given are five observations for two variables, z and y 5 13 20 18 48 57 11 27 a. Choose the corre rect scatter diagram for these data: A. B. 60+ 60 50 50 40 40 30+ 30 20 20 10 10- 10 20 30 40 50 60 x 10 20 30 40 50 60 57 x y 60 60 50+ 50- 40- 40+ 30-...
Given are five observations for two variables, x and
y.
xi
3
12
6
20
14
yi
50
45
55
15
15
(d) Develop the estimated regression equation by computing the
values of b0 and b1 using b1 =
Σ(xi − x)(yi − y)
Σ(xi − x)2
and b0 = y − b1x.
ŷ =
(e) Use the estimated regression equation to predict the value
of y when x = 9.
Observation 1 2 3 4 5 6 7 8...
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