Homework 13 Solutions
16.1
a.
Appropriate.
The response variable is quantitative and this is a comparison of independent
groups.
b.
Not appropriate. The response variable is categorical.
c.
Appropriate.
The response variable is quantitative and this is a comparison of independent
groups.
d.
Not appropriate. It's not a comparison of independent groups. There was only one group and all
individuals listened to all five songs.
16.2
a.
The null hypothesis was that the mean body mass is the same for the three age group
populations.
Using symbols, this would be written as H
0
:
3
2
1
μ
=
μ
=
μ
b
. The
p
value is small, below the usual .05 standard for significance, so it can be concluded that
mean body mass is not the same for the three age group populations.
16.3
a.
The null hypothesis is that mean hours of television watching per day is the same for all
educational degree populations. The alternative hypothesis mean hours of television watching per
day is not the same for all educational degree populations.
In symbols, the null is
H
0
:
5
4
3
2
1
μ
=
μ
=
μ
=
μ
=
μ
.
b.
F
=35.98,
p
value =.000. Reject the null hypothesis; conclude that mean hours of television
watching is not the same for all educational degree populations.
c.
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 '08
 BARROSO,JOAOR
 Statistics, Standard Deviation, Null hypothesis

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