Chapter 9
Form A
Dual Population
1.
Two types of standardized tests are tested for their validity and sample results are
given below. Use a 0.02 significance level to test the claim that the two tests have
the same average validity.
Brand X
Brand Y
________________________
n = 25
n = 22
Conclusion:________________________
2
.
49
=
x
3
.
38
=
x
s = 1.5
s = 2.4
________________________
2.
Two types of dialup Internet services are tested for their speed and sample results
are given below. Use a 0.06 significance level to test the claim that the two tests
have different average validity.
Brand X
Brand Y
________________________
n = 100
n = 120
Conclusion:__________________
2
.
60
=
x
8
.
49
=
x
s = 2.9
s = 3.1
________________________
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document3. A radio station manager conducts an audience survey and finds that among 275 men
surveyed, 18 were listeners, while there were 31 listeners among the 325 women
surveyed. At the 0.05 significance level, test the claim that the proportions of male and
female listeners are the same.
________________________
Conclusion:________________________
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '10
 Kazaryan
 Statistics, Standardized test, Statistical significance, significance level, 2years

Click to edit the document details