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Stat 119
Name____________________________
Red id: __________________________
1.
You collect data and test the hypotheses
50
.
0
:
50
.
0
:
0
≠
=
p
H
p
H
a
A
Pvalue of 0.06 is obtained.
Which of the following is true?
A. A 99% confidence interval for p will not include the value 0.50.
B.
A 95% confidence interval for p will not include the value 0.50.
C.
A 90% confidence interval for p will not include the value 0.50.
D. We cannot make a decision using the information given.
Answer:
2.
We calculate a 95% confidence interval for
p
to be (0.42, 0.58) and want to test the
following:
H
o
:
p
= 0.40 vs.
H
a
:
p
≠
0.40.
We can best conclude:
A. Would not reject H
o
at
α
= 0.10.
B. We would reject H
o
at
α
= 0.01.
C. We would not reject H
o
at
α
= 0.05.
D. We would reject H
o
at
α
= 0.10.
Answer:
3.
Public health officials believe that 90% of children have been vaccinated against measles.
A random survey of medical records at many schools across the country found that
among more than 13,000 children only 89.4% had been vaccinated. A statistician
conducted a two sided hypothesis test and calculated a pvalue of 0.011. Which of the
following statements is correct?
A. There is statistically significant evidence of a substantial change in the percent of
children vaccinated.
B.
There is not statistically significant evidence of a change in the percent of
children vaccinated.
C.
There is statistically significant evidence of a change in the percent of children
vaccinated, and this outcome is also practically significant.
D. There is statistically significant evidence of a change in the percent of children
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This note was uploaded on 05/04/2008 for the course STAT 119 taught by Professor Helen during the Spring '07 term at San Diego State.
 Spring '07
 Helen
 Statistics

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