Business Statistics I: QM 1 Lecture N otes by Stefan W aner (5th printing: 2003) Department of Mathematics‚ Hofstra University BUSINESS STATISTCS I: QM 001 (5th printing: 2003) LECTURE NOTES BY STEFAN WANER TABLE OF CONTENTS 0. Introduction................................................................................................... 2 1. Describing Data Graphically ...................................................................... 3 2. Measures of Central Tendency
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STATISTIC (1) A study of the number of cars sold looked at the number of cars sold at 500 Dealers The smallest dealer had 11 cars sold and the largest had 154 cars sold. If you were going to create a frequency distribution of the number of cars sold using six classes in your frequency distribution‚ which of the following might be a reasonable first class? (a) 0 to 25
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Study Set for Midterm II‚ Chapters 7 & 8 ESSAY. Write your answer in the space provided or on a separate sheet of paper. 1) The average score of all pro golfers for a particular course has a mean of 70 and a standard deviation of 3.0. Suppose 36 golfers played the course today. Find the probability that the average score of the 36 golfers exceeded 71. 2) At a computer manufacturing company‚ the actual size of computer chips is normally distributed with a mean of 1 centimeter
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EG40JQ/12 UNIVERSITY OF ABERDEEN SESSION 2011 – 2012 Degree Examination in EG40JQ SAFETY AND RELIABILITY ENGINEERING Friday 20 January 2012 Notes: (i) (ii) 2.00 p.m. – 5.00 p.m. Candidates ARE permitted to use an approved calculator Data sheets are attached to the paper. Candidates should attempt all FIVE questions. REGULATIONS: (i) You must not have in your possession any material other than that expressly permitted in the rules appropriate to this examination. Where
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Name: ID: Homework 3 Solutions 1. [§6-4] Let X1 ‚ X2 ‚ . . . ‚ X8 be i.i.d. normal random variables with mean µ and standard deviation σ. Define X −µ ‚ T =√ S 2 /n where X is the sample mean and S 2 is the sample variance. (a) Find τ1 such that P(|T | < τ1 ) = .9; and (b) find τ2 such that P(T > τ2 ) = .05. (a) First‚ we notice that T follows a t7 distribution. Since the t distribution is symmetric about 0‚ we have 0.9 = P(|T | < τ1 ) = P(T < τ1 ) − P(T < −τ1 ) = 2P(T < τ1 ) − 1. Thus P(T < τ1
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Answers to Warm-Up Exercises E8-1. Total annual return Answer: ($0 $12‚000 $10‚000) $10‚000 $2‚000 $10‚000 20% Logistics‚ Inc. doubled the annual rate of return predicted by the analyst. The negative net income is irrelevant to the problem. E8-2. Expected return Answer: Analyst 1 2 3 4 Total Probability 0.35 0.05 0.20 0.40 1.00 Return 5% 5% 10% 3% Expected return Weighted Value 1.75% 0.25% 2.0% 1.2% 4.70% E8-3. Comparing the risk of two investments Answer: CV1 0.10 0.15 0.6667 CV2 0.05
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IEEE TRANSACTIONS ON INFORMATION THEORY‚ VOL. 48‚ NO. 7‚ JULY 2002 1849 Performance of Blind and Group-Blind Multiuser Detectors Anders Høst-Madsen‚ Member‚ IEEE‚ and Xiaodong Wang‚ Member‚ IEEE Abstract—In blind (or group-blind) linear multiuser detection‚ the detector is estimated from the received signals‚ with the prior knowledge of only the signature waveform of the desired user (or the signature waveforms of some but not all users). The performance of a number of such estimated linear
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Anand Mohan Goel Anjan V. Thakor University of Michigan Why Do Firms Smooth Earnings?* I. Introduction Corporate earnings management has been much in the news lately. For example‚ Business Week has recently run two cover stories‚ one titled “Who Can You Trust?” (October 5‚ 1998) and the other titled “The Numbers Game” (May 14‚ 2001)‚ that suggest that the credibility of earnings reports is being eroded by earnings management. Arthur Levitt‚ Jr.‚ chairman of the Securities and
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French Nobility The French Nobility has been around since the beginning of the Roman Empire. Similar to the Romans‚ the French organized their state around the nobility and the clergy‚ not taking into account the massive amount of commoners. The Third Estate was finally created centuries later to help bring order and give common people their own place within society. Charles Loyseau and Isabelle de Charriere are two prime sources that compare French nobility during the 17th and 18th century
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Principles of Measurement Systems We work with leading authors to develop the strongest educational materials in engineering‚ bringing cutting-edge thinking and best learning practice to a global market. Under a range of well-known imprints‚ including Prentice Hall‚ we craft high quality print and electronic publications which help readers to understand and apply their content‚ whether studying or at work. To find out more about the complete range of our publishing‚ please visit us on the World
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