c.The slope of the line differs from zero at the 0.029 level of significance. Minitab used

10
Least Square Method: Suggested: page 569 # 1,3,4,6 Webfile Honda Accord ,9 Webfile
Suitcases, 14 Webfile Laptop
1
a.
y.
8
i
5
6

i
=
25

12
4. a.
b.
There appears to be a positive linear relationship between
x
= height and
y
=
weight.
c.
Many different straight lines can be drawn to provide a linear
approximation of the relationship between
x and y
; in part (d) we will
determine the equation of a straight line that “best” represents the
relationship according to the least squares criterion.
d.
325
585
65
117
5
5
i
i
x
y
x
y
n
n
Σ
Σ
=
=
=
=
=
=
2
(
)(
)
110
(
)
20
i
i
i
x
x
y
y
x
x
Σ
−
−
=
Σ
−
=
1
2
(
)(
)
110
5.5
20
(
)
i
i
i
x
x
y
y
b
x
x
Σ
−
−
=
=
=
Σ
−
b
y
b x
0
1
117
5 65
2405
=
−
=
−
=
−
(5. )(
)
.
.
.
y
x
=
−
+
2405
55
e.
.
.
.
. (
)
y
x
=
−
+
=
−
+
=
2405
55
2405
55 63
106
pounds
6.
a.

13
=
i