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printed on:05/07/2009
BUS207.920
NAME__Chris Nagy_________________________
Chapters 12, 13 17
[120 points]
15Dec07
4 points each unless otherwise stated.
EXAM #4
9.01
numerator and four in the denominator.
Use a twotailed test and the
0.10 level of significance.
F>3.68
10 oil stocks was 12.6 percent with a standard deviation of 3.9 percent.
The mean rate of
return on a sample of 8 utility stocks was 10.9 percent withat a satandard deviation of 3.5 percent.
At the 0.05 significance level, can we conclude that there is more vairation in the oil stocks?
[b]
Identify the test statistic.
exceeds 3.68
[c]
Interpret your results.
do not reject the null hypothesis
since the computed /f value is less than the critical value
treatment means are equal.
Use the 0.05 significance level.
Treatment 1
Treatment 2
Treatment 3
[b]
8
3
3
[c]
Sources
SS
df
MS
F
6
2
4
Treatments
62.167
2
31.083
21.941
10
4
5
Treatments
12.750
9
1.417
9
3
4
Total
74.917
11
[b]
Identify the test statistic.
[c]
Complete an ANOVA table.
[d]
State your decision regarding the null hypothesis.
[d] reject the null hypothesis
of private colleges in various regions of the United States.
At the 0.05
level of significance, can we conclude there is a difference in the mean
tuition rates for the various regions?
West ($000)
10
8
7
[b]
11
9
8
[c]
12
10
6
Sources
SS
df
MS
F
Pvalue
10
8
7
Treatments
44.164
2
22.082
25.435
0.000
12
6
Treatments
9.550
11
0.868
Total
53.714
13
[b]
Identify the test statistic.
[c]
Complete an ANOVA table.
[d]
State your decision regarding the null hypothesis.
[d] reject the null hypothesis
tuition in the Northeast and that of the West?
If so, develop a 95%
confidence interval for that difference.
[1]
What is the critical
F
Value for a sample of six observations in the
[2]
A stockbroker at Critical Securities reported that the mean rate of return on a sample of
[a]
[3 points]
State the null and alternate hypothesis.
H
0
:
σ
1
2
= σ
2
2
H
1
:
σ
1
2
≠ σ
2
2
Reject H
0
if the sample variances
s
1
2
/s
2
2
= 1.24
[3]
The following is sample information.
Test the hypothesis that the
[a] H
0
:
μ
1
= μ
2
= μ
3
H
1
:
not all means are the same
reject H
0
if F > 4.26
[a]
[3 points]
State the null and alternate hypothesis.
[4]
The following data are the semester tuition charges ($000) for a sample
Northeast
($000)
Southeast
($000)
[a] H
0
:
μ
1
= μ
2
= μ
3
H
1
:
not all means are the same
reject H
0
if F > 3.98
[a]
[3 points]
State the null and alternate hypothesis.
[e]
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 Fall '07
 RHINE,S
 Business, Normal Distribution, Standard Deviation, Variance, Null hypothesis, Statistical hypothesis testing, Northeast

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