QUESTION 1 (20 MARKS) a. Discuss the difference between a statistic and a parameter. (2 marks) Statistic: numerical value summarizing all data of a sample, therefore characteristic of the sample. (1m) Parameter: numerical value summarizing all data of a population, therefore characteristic of the population. (1m) b. State whether the following statement is true or false. (6 marks) i. Eye color would be an example of qualitative
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)⎜ ⎟ ⎜ ⎟ ⎝ n ⎠ p ± ( zcriticalvalue ) p (1 − p ) n When σ unknown: ⎛ s ⎞ x ± (tcriticalvalue )⎜ ⎟ ⎜ ⎟ ⎝ n⎠ 3. SAMPLE a. Calculate or identify the descriptive statistics: Descriptive statistics needed: • the sample mean • standard deviation • sample size b. Check the conditions for normality: population is normal OR n ≥ 30 Descriptive statistics needed: • the sample proportion • sample size np ≥ 10 AND n(1 − p ) ≥ 10 www.rit.edu/ASC Page 1 of 2 4. STATISTICAL RESULTS a. Find the required
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BLS CASE: UNEMPLOYMENT STUDY The U.S. Bureau of Labour Statistics publishes a variety of unemployment statistics every month. Included in this report is the number of individuals who are unemployed. For the month of November 1998, the bureau reported that the national mean length time of unemployment was 14.6 weeks. A sample of 50 unemployed residents of Philadelphia was chosen in the study. Included in the data are their ages and number of weeks unemployed. Summary of the Sample Data Sample Size
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Development of Statistics September 2007 This paper has been prepared by the Development Data Group of the World Bank and the PARIS21 Secretariat at the request of the PARIS21 Steering Committee. It is part of the follow-up to the Third International Roundtable on Managing for Development Results in Hanoi in February 2007 and the meeting on scaling up support for statistics held during the World Bank and IMF Spring Meetings in Washington in April 2007. Scaling-up Support to Statistics Executive
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intrinsic, extrinsic, and benefits. Use of Statistics and Probability in the Real World Statistics are just about everywhere in the business world, from the upper management to the lower line of employees, statistics are very useful and are a huge part of our daily lives. Statistics are very useful in the financial field; they allow relationships to be studied, compared and monitored for any changes that may occur for example the stock market. Statistics are also used for communicating information
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------------------------------------------------- Ch 1 Introduction 1.1 Why Learn Statistics? * Statistics is the branch of mathematics that transforms numbers into useful information for decision makers. Statistics lets you know about the risks associated with making a business decision and allows you to understand and reduce the variation in the decision-making process. * Statistics provides you with methods for making better sense of the numbers used every day to describe
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deal of confusion in social and educational research is that of types of scales used in measuring behaviour. It is critical because it relates to the types of statistics you can use to analyse your data. An easy way to have a paper rejected is to have used either an incorrect scale/statistic combination or to have used a low powered statistic on a high powered set of data. * Nominal * Ordinal * Interval * Ratio Nominal The lowest measurement level you can use, from a statistical
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probability distributions and inferential statistics to help us in making decisions about our hypotheses. Essentially statistics are a tool that we use in making decisions. Sometimes we use these tools thoughtfully, considering their strengths and weaknesses, sometimes we use them blindly allowing them to dominate our thoughts and remove our interpretations from the role they must play. Remember that there are numerous assumptions behind the use of statistics in guiding our decision-making, they do
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The effect of Chinese characters’ syllable on the capacity of STM Name: Ena ID: 1231600032 United International College Abstract Short-term memory is the capacity for holding a small amount of information in mind in an active, readily available state for a short period of time. (Wikipedia, 2014). Chinese characters and alphabetic words are different. So the capacity of STM may be influenced by some different factors. This experiment was focused on the relationship of syllable (monosyllable
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Evaluation of Statistical Data from Oxford Cereals Thwarting Claims of Consumers Concerned About Cereal Cheaters (CCACC) In the previous correspondence to your office dated April 27, 2014, analysis of data was presented to you showing that Consumers Concerned About Cereal Cheaters (CCACC) misrepresented the Oxford Cereals packaged weights for two (2) of their cereals, Oxford O’s and Alpine Granola Frosted Flakes. I have received further statistical data from Oxford Cereals in support of its claims
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