IE 360
Homework Assignment #6 Solutions
•
8-44
•
8-50 a only
•
9-36 a only
•
9-53 a & b only
•
9-54 a only
•
9-70
•
9-73
•
9-80
•
9-86 a only
•
9-89 a only
**
Note
: several of the Chapter 9 questions ask you to find a P-value – you can skip this part of the
question.
You do not need to find P-values.
8-44
95% confidence interval for
σ
99
.
15
41
=
=
s
n
34
.
59
2
40
,
025
.
0
2
1
,
2
/
=
=
−
χ
χ
α
n
and
43
.
24
2
40
,
975
.
0
2
1
,
2
/
1
=
=
−
−
χ
χ
α
n
46
.
20
13
.
13
633
.
418
35
.
172
43
.
24
)
99
.
15
(
40
34
.
59
)
99
.
15
(
40
2
2
2
2
<
<
≤
≤
≤
≤
σ
σ
σ
The data don’t appear to be normally distributed based on examination of the normal probability plot
below.
Therefore, there is not enough evidence to support that the time of tumor appearance is
normally distributed. So the 95% confidence interval for
σ
is invalid.
TimeOfTumor
Percent
140
120
100
80
60
40
99
95
90
80
70
60
50
40
30
20
10
5
1
Mean
<0.005
88.78
StDev
15.99
N
41
AD
1.631
P-Value
Probability Plot of TimeOfTumor
Normal - 95% CI

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