EXAM #3 PRACTICE TEST
1.
Your investment executive claims that the average yearly rate of return on the stocks she recommends is
more than 10.0%. You plan on taking a sample to test her claim. The correct set of hypotheses is
a.
H
0
:
μ
< 10.0% H
a
:
μ
10.0%
b.
H
0
:
μ
10.0% H
a
:
μ
> 10.0% X
c.
H
0
:
μ
> 10.0% H
a
:
μ
10.0%
d.
H
0
:
μ
10.0% H
a
:
μ
< 10.0%
2.
A weatherman stated that the average temperature during July in Chattanooga is less than 80 degrees. A
sample of 32 Julys is taken. The correct set of hypotheses is
3.
A student believes that the average grade on the final examination in statistics is at least 85. She plans on
taking a sample to test her belief. The correct set of hypotheses is
4.
The school's newspaper reported that the proportion of students majoring in business is more than 30%.
You plan on taking a sample to test the newspaper's claim. The correct set of hypotheses is
5.
In the past, 75% of the tourists who visited Chattanooga went to see Rock City. The management of Rock
City recently undertook an extensive promotional campaign. They are interested in determining whether
the promotional campaign actually
increased
the proportion of tourists visiting Rock City. The correct
set of hypotheses is
a.
H
0
: P > 0.75 H
a
: P
0.75
b.
H
0
: P < 0.75 H
a
: P
0.75
c.
H
0
: P
0.75 H
a
: P < 0.75
d.
H
0
: P
0.75 H
a
: P > 0.75 X
6.
The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles.
Management believes that due to a new production process, the life expectancy of their tires has
increased. In order to test the validity of their belief, the correct set of hypotheses is
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7.
A soft drink filling machine, when in perfect adjustment, fills the bottles with 12 ounces of soft drink.
Any over filling or under filling results in the shutdown and readjustment of the machine. To determine
whether or not the machine is properly adjusted, the correct set of hypotheses is
8.
The academic planner of a university thinks that at least 35% of the entire student body attends summer
school. The correct set of hypotheses to test his belief is
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 Spring '09
 Rollins
 Statistics, Normal Distribution, Standard Deviation, Statistical hypothesis testing

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