Fall Final Exam MC Review 2

# Fall Final Exam MC Review 2 - Twelve people who suffer from...

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Page 1 Twelve people who suffer from chronic fatigue syndrome volunteer to take part in an experiment to see if shark fin extract will increase one's energy level. Eight of the volunteers are men and four are women. Half of the volunteers are to be given shark fin extract twice a day and the other half a placebo twice a day. We wish to make sure that four men and two women are assigned to each of the treatments, so we decide to use a block design with the men forming one block and the women the other. 1. Referring to the information above, a block design is appropriate in this experiment if A) we believe men and women will respond differently to treatments. B) gender equity is an important legal consideration in this study. C) we want the conclusions to apply equally to men and women. D) all of the above. 2. In a recent study, a random sample of children in grades two through four showed a significant negative relationship between the amount of homework assigned and student attitudes. This is an example of A) an experiment. B) an observational study. C) the establishing of a causal relationship through correlation. D) a block design, with grades as blocks. 4. A stratified random sample corresponds to which of the following experimental designs? A) a block design. B) a double-blind experiment. C) an experiment with a placebo. D) a confounded, nonrandomized study. 5. In a test of ESP (extrasensory perception), the experimenter looks at cards that are hidden from the subject. Each card contains either a star, a circle, a wavy line, or a square. An experimenter looks at each of 100 cards in turn, and the subject tries to read the experimenter's mind and name the shape on each. What is the probability that the subject gets more than 30 correct if the subject does not have ESP and is just guessing? A) 0.3100. B) 0.2500. C) 0.1251. D) less than 0.0001. 6. Suppose X is a random variable with the B ( n = 6, p = 2/3) distribution. The probability X is at least 5 is A) 0.6667. B) 0.4444. C) 0.3512. D) 0.0878.

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Page 2 There are 20 multiple-choice questions on an exam, each having responses a, b, c, or d. Suppose a student guesses the answer to each question, and the guesses from question to question are independent. Let X be the number of questions for which the student has the same answer as the person sitting next to him on his right. 7. The distribution of
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## This note was uploaded on 12/20/2010 for the course STAT 3311 at University of Houston.

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Fall Final Exam MC Review 2 - Twelve people who suffer from...

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