practice midterm

practice midterm - Economics 120B Fall 2007 Dr. Maria...

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Economics 120B Fall 2007 Dr. Maria Cândido Student Name:_____________________________________ Student ID:________________________________________ Economics 120B Midterm Examination Fall Quarter November 15 th , 2007 Instructions: a. You have 80 minutes to finish your exam. Write your name and ID number on the upper left corner of this page. b. Confirm that your test has 10 pages. Make sure you find the formula sheet, as well as the standard normal distribution table, in the pages of your exam. The last page can be used as scratch paper. c. There are two parts to this exam – multiple-choice questions (Part I) and longer questions (Part II). You do not need to justify your answers for the multiple-choice questions. Show ALL your work for the longer questions. d. Use a pen to write your answers. You give up your right to a regrade if you choose to use a pencil. e. The table below indicates how points will be allocated on the exam. You can answer the questions in any order you like. Use your time carefully and efficiently. Question Points Part I 24 Part II 1. 18 2. 18 3. 28 4. 6 5 6 Exam Total 100 f. With you, you should only have a pen, and a calculator. g. You will NOT be allowed to leave the room during the exam. Turn off your cell phone and your IPod, and good luck! 1
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Economics 120B Fall 2007 Dr. Maria Cândido PART I: Multiple-Choice Questions (2 points each, 24 points total) 1) An experimenter wishes to test whether or not two types of fish food (a standard fish food and a new product) work equally well at producing fish of equal weight after a 2-month feeding program. The experimenter has 2 identical fish tanks (1 & 2) to put fish in and is considering how to assign the 40 tagged fish to the tanks. To properly assign the fish, one step would be to: a. obtain pairs of fish whose weights are virtually equal at the start of the experiment and randomly assign one to the group tank 1, the other to tank 2, with the feed assigned at random to the tanks. b. put the heavier fish into tank 2, and assign the feed at random to the tanks. c. assign the fish at random to the two tanks and give the standard feed to tank 1. d. obtain pairs of fish whose lengths are virtually equal at the start of the experiment and randomly assign one to the group tank 1, the other to tank 2, with the feed assigned at random to the tanks. 2) The sample average a. is a single number and as a result cannot have a distribution. b. is a random variable and has a probability distribution called the standard normal distribution. c.
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practice midterm - Economics 120B Fall 2007 Dr. Maria...

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