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Unformatted text preview: Final Exam - Fall 2005 - ST 370 Online/Distance - A Circle the answer. All questions are worth 3 points. 1. If the same number is added to every member of a sample, then the sample standard deviation will not change. A. True B. False 2. A is a numerical value calculated from all the units in the sample. A. parameter B. statistic C. dependent variable D. none of the above 3. The interquartile range is computed for a set of data and found to be 45.7 grams. This means: A. 50% of the data is less than 45.7 grams. B. 25% of the data is less than 45.7 grams. C. 68% of the data lies within 45.7 inches of the mean. D. The middle 50% of the data is spread out over 45.7 grams. E. none of the above 4. Consider a system having three independent components with reliabilities through time t of 0.90, 0.80, and 0.95. If the first two components operate in parallel in a mini-system and this mini-system is in series with the 3rd component, the system reliability through time t is (to 3 decimals) A. 0.729 B. 0.931 C. 0.684 D. 0.829 E. none of the above 5. A random variable X has density function f ( x ) = 3 e- 3 x for all 0 < x . Find the probability that X falls in the range [1 , 2]. (to 4 decimals) A. 0.0473 B. 0.1419 C. 0.0498 D. 1.0000 E. 0.0025 1 Use information in the paragraph below to answer the following 5 questions. Botanists were investigating the optimal conditions for growing Golden Torch cacti. The researchers examined the effects of a hydrophilic polymer and irrigation regime on growth. The hydrophilic polymer was either used or not used and five irrigation regimes were employed: none, light, medium, heavy, and very heavy. Each treatment combination was applied to 3 flats of cacti. 6. This is an A. Experiment B. Observational study 7. is an explanatory variable (factor)....
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This note was uploaded on 01/16/2012 for the course ST 370 taught by Professor Nail during the Spring '08 term at N.C. State.
- Spring '08