poorly designed questionnaire may not obtain the results the firm or organization is looking for. There are four categories in which numbers are generally grouped. In increasing order of sophistication‚ they are (1) nominal numbers‚ (2) ordinal numbers‚ (3) intervally scaled numbers‚ and (4) ratio-scaled numbers. This paper will examine each briefly and how they can be used effectively in the design of a survey questionnaire. Qualitative Data Data that can be categorized into one of several
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Practice Problems for Confidence Intervals X ± Z σ/n ; X ± t s/n ; p ± Z (p(1-p)/n) 1. A press release issued by our university claims that West Chester students study at least as much as the national average for students at four year universities. Across the nation‚ 73 percent of all students at four year universities study at least four hours per week. Seventy percent of one hundred randomly selected West Chester students surveyed claimed to study more than four hours per week.
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Confidence Intervals Consider the following question: someone takes a sample from a population and finds both the sample mean and the sample standard deviation. What can he learn from this sample mean about the population mean? This is an important problem and is addressed by the Central Limit Theorem. For now‚ let us not bother about what this theorem states but we will look at how it could help us in answering our question. The Central Limit Theorem tells us that if we take very many
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1. The sampling frequency of the following analog signal‚ s(t)=4 sin 150πt+2 cos 50πt should be‚ a) greater than 75Hz b) greater than 150Hz c) less than 150Hz d) greater than 50Hz 2. Which of the following signal is the example for deterministic signal? a) Step b) Ramp c) Exponential d) All of the above 3. For energy signals a) The energy will be finite and power will be infinite b) The energy will be finite and power will be zero c) The energy will be zero and power will be infinite d) Both energy
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A Study in Determining Confidence Intervals at 95% Charlesatta Johnson PH6014 October 9‚ 2013 Dr. Rodrick Frazier A Study in Determining Confidence Intervals at 95% As hypothesized‚ high cholesterol levels in children can lead to their children being affected with hyperlipidemia. A study is conducted to estimate the mean cholesterol in children between the ages of 2 - 6 years of age. It also attempted to establish a correlation as to the effect family history has on the onset of the disease
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STA3003 Fall 2012 Assignment 5 (Total Points Possible: 15) Name: Banner ID: Instructions: Use this page as your cover page‚ and attach your groupwork behind your work. Your assignment answers should be in complete and grammatically correct sentences. 1. According to the National Center for Health Statistics (2004)‚ 22.4% of adults are smokers. A
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As a result of scarcity of resources‚ the consumer cannot satisfy all his wants. He has to choose as to which want is to be satisfied first and which afterward if the resources permit. The consumer is confronted in making a choice. For example‚ a man’ is thirsty. He goes to the market and satisfies his thirst by purchasing coca’-cola instead of tea. We are here to examine the economic forces which. Make him purchase a particular commodity. The answer is simple. The consumer buys a commodity because
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Introduction Wrong or inaccurate measurements can lead to wrong decisions‚ which can have serious consequences‚ costing money and even lives. The human and financial consequences of wrong decisions based on poor measurement being taken in matters as important as environmental change and pollution are almost incalculable. It is important therefore to have reliable and accurate measurements which are agreed and accepted by the relevant authorities worldwide. Metrologists are therefore continuously
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34. Information from the American Institute of Insurance indicates the mean amount of life insurance per household in the United States is $110‚000. This distribution follows the normal distribution with a standard deviation of $40‚000. a. If we select a random sample of 50 households‚ what is the standard error of the mean? b. What is the expected shape of the distribution of the sample mean? c. What is the likelihood of selecting a sample with a mean of at least $112‚000? d. What is the likelihood
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Nominal Group Technique In 1968 André Delbecq co-developed with Andrew H.Van de Ven the Nominal Group Technique‚ which has diffused worldwide to become the most widely used method of group brainstorming. and has been applied to adult education program planning by Vedros. What is the NGT? The Nominal Group Technique (NGT)‚ is a decision making method for use among groups of many sizes‚ who want to make their decision quickly‚ as by a vote‚ but want everyone’s opinions taken into account
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