Chapters 1-3:In order to control costs‚ a company wishes to study the amount of money its sales force spends entertaining clients. The following is a random sample of six entertainment expenses (dinner costs for four people) from expense reports submitted by members of the sales force. $157‚ $132‚ $109‚ $145‚ $125‚ $139. Calculate the mean and sample variance(s^2) and standard deviation. Mean = 807/6 = 134.5. Sample Variance = (109925 – (807^2/6)/6-1 = (109925 – 108541)/5 = 1384/5 = 276.8.
Free Random variable Standard deviation Normal distribution
ECO 72 INTRODUCTION TO ECONOMIC STATISTICS Topic 2 Measures of Central Tendency These slides are copyright © 2003 by Tavis Barr. This material may be distributed only subject to the terms and conditions set forth in the Open Publication License‚ v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). Measures of Central Tendency This chapter looks at three different concepts of how we describe a “typical” element of a data set. Mean
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Descriptive Statistics Descriptive statistics is the analysis of data that summarize data in a way such that‚ meaningful patterns emerge from the data. Descriptive statistics do not allow us to reach to the conclusions beyond the data we have analyzed regarding any hypotheses we might have made. They simply describe our data. Measures of Central Tendency: these are ways of describing the central position of a frequency distribution for a group of data through: Mode: Sum of all observations divided
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PAKISTAN WINNING 20-20 WORLD CUP: A Nation battling Terrorist Attacks on a daily basis‚ An Attack on a visiting cricket team a few months ago threatened to isolate its national team and the country as a whole from the rest of the cricketing world with all the countries canceling their tours citing security reasons. To Make Matters Worse‚ The ICC cancelled all the matches which were allotted to Pakistan as a Host Nation for the 2011 Cricket World Cup & also shifted the Champions Trophy
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Unit 2: Instructor Graded Assignment Equations In this and future Instructor Graded Assignments you will be asked to use the answers you found in the Unit 1 Assignment. Note: For these questions you need to cite a reliable source for information‚ which means you cannot use sites like Wikipedia‚ Ask.com®‚ and Yahoo® answers. If you do use those sites the instructor may award 0 points for your response. The Assignment problems must have the work shown at all times. The steps for solving the problems
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Statistics Investigation Introduction A new drug was developed that was claimed to lower the cholesterol level in humans. A leading heart specialist was interested to know if the claim made by the company selling the drug was accurate. They enlisted the help of 50 patients. They agreed to take part in an experiment in which 25 patients would be randomly allocated to a group that would take the new drug and the other 25 would take an identical looking pill that was a placebo (a sugar pill that
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Research and statistics for managerial decision making Assignment 2 Mohammed Ahmed Ali
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false‚ then we will make a type II error. Analysis work for the first survey (270 patrons) We conducted hypothesis testing with a sample size of 270 people‚ 20 people agree with Tommy‚ and resent the commercials before the movie. P = 10% (percentage for which Mr. Plex and consortium considers to determine to settle with Tommy) P^ = 20/270 = 0.074 = 7.4% (percentage of sample of those who agree with Tommy and resented the ads) n = 270 (Patrons); P= 10% = 0.1; P^ = 0.074; q = 1- 0.1=0.9 Since：
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Crime Statistics The crime statistics focus on giving out specific detailed information to the public and the government of United States about all the crime taken place in a certain period of time. The crime related information for the statistics is collected and published by different federal government agencies such as FBI‚ the department of Justice‚ the National Institute of Justice‚ etc. The statistics include data about how much crime is there; when and where crime occurs; what type of crime
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lower tolerance of fiber connectors Graded index fiber has a core of varying refractive index it has a high value n at the core which dec radially towards the cladding has a multimode graded index fiber multimode graded index fiber under parabolic index profile shows a parabolic transmission of rays through it through geometrical optics‚large no of refractions are observed due to varying refractive index from core to cladding multimod graded index fiber hav a lower intermodal dispersion
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