6.20 Hypotheses: Let the proportion of sentence with the word whereas by
null hypothesis is
H 0 : =0.06 , and the alternative hypothesis is
Test Statistic: Its known that the sample proportion
error
se=
^ =
. The
H a : 0.06 .
0
=0
300
and standard
0 (1
Chapter 10
10.4 There is no causality between X=size of police force and Y=crime rate. To imply X
causes Y, they need to satisfy three criteria: association, time order and eliminate
alternative explanations. Although X and Y have an association, which is
9.10 (a) The top point suggested the data from Palm Beach county may be an extreme
outlier, which means there are more votes for Buchanan than we predicted based on the
number of votes for Perot.
(b) When
x=30739 , predicted Buchanan vote in Palm Beach co
Chapter 8 (p247)
8.4 A contingency table relating opinion about the U.S. by year of survey for Germany:
Year of survey for Germany
2000
2006
Favorable Opinion about the U.S.
Yes
No
78%
22%
37%
63%
Total
100%
100%
The response variable: Percentage of Germa
Chapter 5 (p133)
5.14 Denote the population proportion who would respond this was probably or
definitely not true by . Of n=1095 respondents, 53.8% said this was probably or
definitely not true, so
^ =0.538 . Then
1^ =10.538=0.462 . That is, 53.8%
sample