2r051 CDC Volulme 3
5 Level CDC Volume 3
- 1.1. What is the value of 5 / 2 x 6?
- A.
0.3
- B.
8.4
- C.
15.0
- D.
30.0
- 2.2. Compute the difference of the signed numbers -17 -(-10).
- A.
+3.0
- B.
-3.0
- C.
-7.0
- D.
-27.0
- 3.3. Eighty is 40 percent of what number?
- A.
200
- B.
320
- C.
400
- D.
500
- 4.4. What statistical method uses only a sample of data?
- A.
Inferential
- B.
Descriptive
- C.
Data survey
- D.
Randomization
- 5.5. Which action would require the use of the descriptive statistics method?
- A.
Draw a conclusion about data
- B.
Choose a random sample of data.
- C.
Summarize a large amount of data.
- D.
Generalize from the results of small samples.
- 6.6. In the equation Y=X+2, what does the symbol "Y" represent?
- A.
Exponent.
- B.
Inequality.
- C.
Subscript.
- D.
Variable.
- 7.7. What is the value of 43?
- A.
64.
- B.
24.
- C.
12.
- D.
7.
- 8.8. Which is the best example of a population in statistical language?
- A.
Yearly B-1 failures at Dyess AFB.
- B.
Weekly C-130 failures at Scott AFB.
- C.
Monthly E-3C failures at Tinker AFB.
- D.
Total T-38s failures across the Air Force
- 9.9. A sample of a population that is taken in such a manner that each value has an equal chance of being selected is referred to as a
- A.
Biased sample.
- B.
Random sample.
- C.
Sampling theory.
- D.
Sampling application.
- 10.10. What are measures, such as the mean or median, called if they are computed from a sample?
- A.
Statistics.
- B.
Parameter.
- C.
Population.
- D.
Distribution.
- 11.11. Which measurement scale consist of equal intervals between scale values and an arbitrary zero point?
- A.
Ratio.
- B.
Nominal.
- C.
Ordinal.
- D.
Interval.
- 12.12. You are given two pieces of test equipment that must be loaded on a pallet. Once piece weighs 125 pounds and the other piece weighs 3.5 times as much. Using the ratio measurement scale, how much does the second piece of equipment weight?
- A.
375.0 pounds.
- B.
415.5 pounds
- C.
437.5 pounds
- D.
500.0 pounds
- 13.13. The second step in making a frequency distribution is to
- A.
Determine the range of the data.
- B.
Determine the class interval size.
- C.
Range the data from largest to smallest.
- D.
Rang the data from smallest to largest.
- 14.14. Given the following noncumulative frequency distribution, which class interval will give you 18 classes?
- A.
0.1.
- B.
0.2.
- C.
0.3.
- D.
0.4.
- 15.15. If you contruct a frequency distribution and the class interval is too large, the result is
- A.
A loss of detail.
- B.
Side gaps between items.
- C.
Overlapping lower limits.
- D.
A loss of smoothness and simplicity.
- 16.16. When constructing a frequency polygon, what are plotted against the corresponding midpoints?
- A.
Series of rectangles.
- B.
Individual values of data.
- C.
Lower limit and baseline.
- D.
Frequencies of the various class intervals.
- 17.17. Which graphical method gives the best representation of the number of individual values in each class?
- A.
Histogram.
- B.
Frequency polygon.
- C.
Overlapping polygon.
- D.
Overlapping histogram.
- 18.18. What measure of central tendency is the most typical value in a distribution?
- A.
Mean.
- B.
Mode.
- C.
Median.
- D.
Weighted mean.
- 19.19. What is the mode of a sample consisting of these values: 6,9,10,3,2,6 and 25?
- A.
2.
- B.
6.
- C.
8.
- D.
18.
- 20.20. The median cannot be used with data from which measurement scale?
- A.
Nominal.
- B.
Interval.
- C.
Ordinal.
- D.
Ratio.
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