Assignment 5
Due date: 25 November 2009
Total number of points: 21
Q
1.
(7.11) A study was conducted to determine whether relaxation training, aided by biofeedback and meditation,
could help in reducing high blood pressure Subjects were randomly allocated to a biofeedback group or a control
group.
The biofeedback group received training for eight weeks.
The table reports the reduction in systolic
blood pressure (mm Hg) after eight weeks.
(a)
Compute estimated standard error of the difference in mean.
(b)
Construct a 95% confidence interval for the difference in mean response.
(c)
Interpret the confidence interval in (a).
Biofeedback
Control
n
1
=69
n
2
=73
¯
y
1
= 13
.
8
¯
y
2
= 4
.
0
SE
¯
y
1
= 1
.
34
SE
¯
y
2
= 1
.
30
Q
2.
(7.30) In a study of the periodical cicada, researchers measured the hind tibia lengths of the shed skins of 110
individuals. Results for males and females are shown in the table:
Male
Female
n
1
=60
n
2
=50
¯
y
1
= 78
.
42
¯
y
2
= 80
.
44
s
1
= 2
.
87
s
2
= 3
.
52
(a)
Use
t
test to investigate the dependence of tibia length on gender in this species. Use
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 Spring '09
 ALYAOTHMAN
 Statistics, Standard Deviation, radish sprout growth

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