CHAPTER TWO DESCRIPTIVE STATISTICS: TABULAR AND GRAPHICAL PRESENTATIONS MULTIPLE CHOICE QUESTIONS 1. A frequency distribution is a tabular summary of data showing the a. fraction of items in several classes b. percentage of items in several classes c. relative percentage of items in several classes d. number of items in several classes Answer: d 2. A frequency distribution is a. a tabular summary of a set of data showing the relative frequency b. a graphical form of
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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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have a random selection method‚ you must set up some process or procedure that assures that the different units in your population have equal probabilities of being chosen. Some basic terms • • • • N - the number of cases in the sampling frame n - the number of cases in the sample NCn - the number of combinations (subsets) of n from N f = n/N - the sampling fraction 1. Simple Random Sampling The simplest form of random sampling is called simple random sampling. • • Objective:
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Hypothesis: Ho: P = .10 (Mr. Plex and consortium will seriously consider settlement) H1: P < .10 (Mr. Plex and consortium will rigorously defend any lawsuit by Tommy) Analysis： For this case‚ we use 0.01 as the significance level. In a hypothesis test‚ a Type I Error occurs when the null hypothesis is rejected when it is in fact true. That means if the consortium decides to consider a settlement when greater than 10% of the patrons resented ads/commercials is true and we reject the null hypothesis
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Professor Dumonceaux Descriptive Statistics Paper 2 June 2014 Finding a New Home According to Trochim‚ “Descriptive statistics are used to describe the basic features of the data in a study. They provide simple summaries about the sample and the measures. Together with simple graphics analysis‚ they form the basis of virtually every quantitative analysis of data” (Trochim‚ 2006). For many years‚ many studies and researches have been done in real estate market. Buyers need to conduct researches
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Managerial Statistics Distinguish between primary data and secondary data? OBJECTIVE The main objective of this topic is to measure the degree of relationship between the variables under consideration.The correlation analysis refers to the techniques used in measuring the closeness of the relationship between the variables. DEFINITION Some important definitions of correlation are given below: 1. “Correlation analysis deals with the association between two or more variables”. ---- Simpson &
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Introduction The current state of the world economy is quite uncertain. Economic statistics that governments and other financial institutions use to project the economy imply that the world economy is shrinking. Since 2008‚ the state of the American economy has not been attractive. For instance‚ the United States economy has not registered any significant growth for the last three years. The 2011 second quarter results indicated that gross domestic product improved by 1%. At the same time‚ there
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Result: Actually‚ it can be obviously seen that the female has more frequency to be survived than male. Also‚ the 1st class of passengers are less frequency to be died but 3rd class of passengers are more frequency to be died. Quoting some two-test statistic‚ the degree freedom is 456. The t is 1.047 and the p-value is 0.2957 which >0.05 and does not reject Ho. Conclusion: In conclusion‚ the determinant of Sex can affect the survival of passengers as it can be considered in the first graph. The
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Statistics Essay Mean is the arithmetic average of a distribution‚ obtained by adding the scores and then dividing it by the number of scores there are. Median is the middle score in a distribution; half the scores are above it and half the scores are below it. Mode is the most frequently occurring score in a distribution. A skewed distribution is when the distribution is leaning toward one side. It is the measure asymmetric probability and its real value of data. A skewed would be like a group
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Federal Express – delivering the goods Kevan Scholes This case study looks at how new business models can create vast improvements in competitiveness. However‚ the models must be suited to the business environment at the time and will have a ‘shelf-life’ as the business environment changes. The case study looks at one on the world’s most successful adopters of a new business model that transformed the airfreight and package delivery sectors worldwide. But the advent of the internet in the mid-1990s
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