This preview shows pages 1–4. Sign up to view the full content.
Bus Stat Test 3 Practice Test
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1.
The level of significance
a.
can be any positive value
b.
can be any value
c.
is (1  confidence level)
d.
can be any value between 1.96 to 1.96
____
2.
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
a.
H
0
:
μ
< 40,000
H
a
:
μ
≥
40,000
b.
H
0
:
μ
≤
40,000
H
a
:
μ
> 40,000
c.
H
0
:
μ
> 40,000
H
a
:
μ
≤
40,000
d.
H
0
:
μ
≥
40,000
H
a
:
μ
< 40,000
Exhibit 91
n = 36
= 24.6
S = 12
H
0
:
μ
≤
20
H
a
:
μ
> 20
____
3.
Refer to Exhibit 91. If the test is done at 95% confidence, the null hypothesis should
a.
not be rejected
b.
be rejected
c.
Not enough information is given to answer this question.
d.
None of these alternatives is correct.
Exhibit 93
n = 49
= 54.8
s = 28
H
0
:
μ
= 50
H
a
:
μ
≠
50
____
4.
Refer to Exhibit 93. The pvalue is equal to
a.
0.1151
b.
0.3849
c.
0.2698
d.
0.2302
____
5.
Refer to Exhibit 93. If the test is done at the 5% level of significance, the null hypothesis should
a.
not be rejected
b.
be rejected
c.
Not enough information given to answer this question.
d.
None of these alternatives is correct.
1
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentExhibit 94
The manager of a grocery store has taken a random sample of 100 customers. The average length of time it
took the customers in the sample to check out was 3.1 minutes with a standard deviation of 0.5 minutes. We
want to test to determine whether or not the mean waiting time of all customers is significantly more than 3
minutes.
____
6.
Refer to Exhibit 94. The standardized test statistic is
a.
1.96
b.
1.64
c.
2.00
d.
0.056
____
7.
For a twotailed test at 86.12% confidence, Z =
a.
1.96
b.
1.48
c.
1.09
d.
0.86
____
8.
For a onetailed test (upper tail), a sample size of 18 at 95% confidence, t =
a.
2.12
b.
2.12
c.
1.740
d.
1.740
Exhibit 96
A random sample of 16 students selected from the student body of a large university had an average age of 25
years and a standard deviation of 2 years. We want to determine if the average age of all the students at the
university is significantly different from 24. Assume the distribution of the population of ages is normal.
____
9.
Refer to Exhibit 96. At 95% confidence, it can be concluded that the mean age is
a.
not significantly different from 24
b.
significantly different from 24
c.
significantly less than 24
d.
significantly less than 25
____
10.
For a onetailed test (lower tail) at 89.8% confidence, Z =
a.
1.27
b.
1.53
c.
1.96
d.
1.64
____
11.
For a onetailed test (upper tail), a sample size of 26 at 90% confidence, t =
a.
1.316
b.
1.316
c.
1.740
d.
1.740
____
12.
For a onetailed test (lower tail), a sample size of 22 at 95% confidence, t =
a.
1.383
b.
1.383
c.
1.717
d.
1.721
2
____
13.
Which of the following statements is
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview. Sign up to
access the rest of the document.
 Spring '10
 smith
 Accounting

Click to edit the document details