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First Exam  Fall 2004  ST 370 Online  A
Darken the circle on the answer sheet corresponding to your answer. Use a number 2 pencil. Stray
marks on the form may cause errors. All questions are worth 5 points.
1. The following sample was collected: 17, 24, 9, 36, 13. The sample mean is (to 2 decimals)
A. 17.00
B. 17.39
C. 18.92
D. 19.80
E. None of the above.
2. The sample range of the problem 1 sample is
A. 7
B. 27
C. 24
D. 15
E. None of the above.
3. The sample standard deviation of the problem 1 sample is (to 2 decimals)
A. 10.62
B. 12.07
C. 14.19
D. 90.16
E. None of the above.
4. When interaction is present in an experiment with a factorial treatment structure, which of
these statements is correct?
A. The change in response variable means across levels of one factor depends on the levels of the
other factors.
B. Interaction is revealed in an mplot by parallel lines.
C. Interaction cannot be detected in a blocked experiment.
D. The change in response variable means across levels of one factor is uniform.
E. All of the above.
5. A 60th percentile is
A. The same as the .40 fractile or quantile.
B. The point where 40 percent of the population or data lie above it.
C. Close to the 3rd quartile.
D. Both A. and B.
E. None of the above.
1
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View Full DocumentHistogram of x
x
Density
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(a)
Histogram of x
x
0
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0.1
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(b)
6. What can we say about the data in the above two histograms?
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