Midterm-BUAD310-fall07-solution

Midterm-BUAD310-fall07-solution - BUAD 310-Midterm First...

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BUAD 310-Midterm First Draft Dr. Ansari 10/17/07 NAME: ______________ __Solution_ ____________________ BUAD 310 USC ID: ______________________________________________ Fall 2007 Dr. ARIF ANSARI BUAD310 – Fall 2007 Midterm This exam is closed book. 2 Sheet (4 pages) of formula and definitions is allowed. Write your answers on the exam sheets. If you need more space, continue your answer on the back of the page. Make sure you have all 14 pages! The exam is 100 minutes (1hr and 40 minutes) long. Total of 100 points. They are not equally weighted, nor are they of equal difficulty. The number of points each question is worth is printed with the question. Read the questions carefully. If you are unsure of the interpretation, come ask. Unless otherwise stated in a question, you must show your work to obtain full credit. If you can't complete a problem for any reason, explain what concepts are at issue, and how you would solve the problem. It is, in any case, a good idea to explain what your reasoning is in English. If I can't tell that you understood what you were doing, I can't give you credit, particularly if you get the wrong numerical answer. GOOD LUCK! This is copyrighted material, cannot be copied or sold without the approval of Dr. Ansari and USC. 1
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BUAD 310-Midterm First Draft Dr. Ansari 10/17/07 Part 1 -MULTIPLE CHOICE [2 points each] 1. A newspaper examines the correlation between weight of large cars and the death rates in car accidents. Initially they looked at large cars and found the correlation to be 0.3, now they decide to study the correlation between all types of cars and the death rates , In general, what would be the new sample correlation? a) Lower than 0.3 b) Higher than 0.3 Answer, In general, without range restriction correlation becomes larger. c) Zero d) Cannot be predicted to be lower or higher. 2. If a study is found to be statistically significant (Reject Ho) at 1 % significance Level and it is a lower-tail test then we can say the most likely test statistics is a) t ts = -3 Answer, Lower-Tail test, most evidence by large magnitude negative number b) t ts = -1 c) t ts = 0 d) t ts = 1 e) t ts = 3 3. Suppose we wish to test Ho: µ = 0.5 Vs Ha: µ 0.5. What will result if we don’t reject Ho ? a) We have made a Type I error b) We have made a Type II error c) We have made a correct decision d) We did not make Type I error Answer e) We did not make Type II error Since we don’t reject Ho, either we committed a type II error or made a correct decision. We cannot say it for sure. But we did not make a type I error. Ho is True Ho is False Reject Ho Type I error Correct Decision Don’t Reject Ho Correct Decision Type II error This is copyrighted material, cannot be copied or sold without the approval of Dr. Ansari and USC. 2
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BUAD 310-Midterm First Draft Dr. Ansari 10/17/07 4. Which of the following statements best describes what is meant by the correlation between two variables? a)
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This note was uploaded on 02/16/2009 for the course BUAD 310 taught by Professor Lv during the Fall '07 term at USC.

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Midterm-BUAD310-fall07-solution - BUAD 310-Midterm First...

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