to contact the hard-to-reach Simplified and enhanced panel management External Internet panels simplify life for the research supplier Disadvantages of Online Surveys Internet users are not representative of the population as a whole Unrestricted internet sample Sample frame needed may not be available on the internet Lack of "callback" procedures to clarify open-end responses Potential for questionnaire programming errors Lack of bandwidth Know types of online focus groups Real-Time Online Focus Groups
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from entering the war. However‚ small numbers of ships were being sunk‚ until Germany launches Unrestricted U-Boat Warfare. With Unrestricted U-Boat Warfare‚ Germany was able to sink much more ships than before and sink a large amount of the allies’ supplies. If Germany had applied Unrestricted U-Boat Warfare earlier‚ their chance of winning the war would have increased dramatically. The U-Boat was an incredibly advanced underwater war vehicle
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Lecture Notes on Introductory Statistics‚ I (P.P. Leung) Lecture notes are based on the following textbook: N.A. Weiss (2012)‚ Introductory Statistics‚ 9th edition‚ Pearson. Chapter 1 The Nature of Statistics 統計本質 §1.1 Two kinds of Statistics §1.4 Other Sampling Designs (其他抽樣方法) Chapter 1 The Nature of Statistics 統計本質 What is Statistics? 何謂統計? From Wikipedia‚ the free encyclopaedia: Statistics is a mathematical science pertaining to the collection‚ analysis‚ interpretation
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Individual Assignment for Week Five Individual Assignment for Week Five Problem one in Chapter11 Define the appropriate target population and the sampling frame in each of the following
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Coefficient of variation Sample-> CY=s/x 1. A relative measure of dispersion 2. Adjusts for differences in magnitudes of the means. 3. Does not have units of measure 4. Allows for direct comparisons of mean-adjusted dispersion across different data sets. Percentiles and quartiles Coefficient of determination The proportion of variation in the dependent variable ”explained” by the independent variable. 因變量的變化的比例“解釋”的獨立變量。 (Correlation coefficient)^2=r^2 R=0.90 (0
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There are many ways to select a random sample. Four of them are discussed below: Simple Random Sampling: In this sampling technique‚ each sample of the same size has the same probability of being selected. Such a sample is called a simple random sample. One way to select a simple random sample is by a lottery or drawing. For example‚ if we need to select 5 students from a class of 50‚ we write each of the 50 names on a separate piece of paper. Then‚ we place all 50 names in a hat and mix them thoroughly
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university students as my sample population because in today’s society‚ when students enter into university there is an academic and personal transition that can sometimes cause an imbalance in regular eating and sleeping habits. Objective: This research aims to falsify the claims that if you would sleep less‚ you would gain weight‚ and you would lose weight if you would sleep more. It also aims at knowing the real effect of sleep to the weight of students attending a sample university Data Collection:
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Data Collection Methods. Introduction Data collection is the process of gathering and measuring information on variables of interest‚ in an established systematic fashion that enables one to answer stated research questions‚ test hypotheses‚ and evaluate outcomes. Data Collection Techniques include the following: Personal Interviews Conducting personal interviews is probably the best method of data collection to gain first hand information. It is however‚ unsuitable in cases where there are
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Sample Assessment Materials Edexcel GCSE in Statistics (2ST01) Inside this Sample Assessment Materials pack you’ll find: • Accessible papers to help you and your students prepare for the assessment • Clear and concise mark schemes to • Supported controlled assessment let you know what the examiners are looking for information including sample tasks and assessment criteria to share with students. Issue 3 February 2010 Welcome to the GCSE 2009 Statistics Sample Assessment Materials
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measure of tolerable error to a smaller value would cause the sample size to be: 7. a. Smaller. b. Larger. c. Unchanged. d. Indeterminate. 8. ANSWER: B 9. 3. Which of the following sampling plans would be designed to estimate a numerical measurement of a population‚ such as a dollar value? 10. a. Numerical sampling. b. Discovery sampling. c. Sampling for attributes. d. Sampling for variables. 11. ANSWER: D 12. 4. Based on a random sample‚ it is estimated that four percent‚ plus or minus two percent
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