CHAPTER 10: TWO-SAMPLE TESTS WITH NUMERICAL DATA 1. The t test for the difference between the means of 2 independent populations assumes that the respective a) sample sizes are equal. b) sample variances are equal. c) populations are approximately normal. d) all of the above ANSWER: c TYPE: MC DIFFICULTY: Moderate KEYWORDS: pooled-variance t test‚ assumption 2. The t test for the mean difference between 2 related populations
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Comparison of Crime Statistics Crime statistics endeavour to provide statistical measures of crime in societies. They provide a point of analysis and comparison‚ allow countries to form long-term patterns and trends and can help to develop and reform criminal justice policies as well as being more meaningful than raw numbers. Using the countries of Bahrain and the United States as a comparison point for the following issues which surround crime statistics such as biases‚ agendas and general influences
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Applied Research and Statistics QNT561 Research and Sampling Designs Shindeera Robinson June 21‚ 2010 Chapter 8 21. What is sampling error? Could the value of the sampling error be zero? If it were zero‚ what would this mean? Sampling error is the difference between the statistic estimated from a sample and the true population statistic. While we would expect the sampling error to not be zero‚ it is not impossible. For example if you were evaluating the ethnicities of a population and everyone
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Chapter 8 29. The travel-to-work time for residents of the 15 largest cities in the United States is reported in the 2003 Information Please Almanac. Suppose that a preliminary simple random sample of residents of San Francisco is used to develop a planning value of 6.25 minutes for the population standard deviation. If we want to estimate the population mean travel-to-work time for San Francisco residents with a margin of error of 2 minutes‚ what sample size should be used? Assume 95% confidence
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Week 6 Statistic Course Reflection Paper Heather RN‚ CCRN Statistical Methods and Applications My daughter is currently studying international economics and business law. She has taken several statistic and advanced actuary classes‚ after completing this course I have a great deal of respect for her ambitions and studies. Statistics has never been particularly interesting to me only because I did not realize how much I depend on statistical studies in my personal and professional life. I was afraid
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062896401 Home Size 31.69164882 24.44661008 1.296361692 0.223968044 The formula for the coefficient of correlation‚ . = 0.076. a. Compute the coefficient of correlation is .308 b. Determine the coefficient of determination. Regression Statistics Multiple R 0.37931016 R Square 0.143876197 Adjusted R Square 0.058263817 Standard Error 15.25058359 Observations 12 The coefficient of determination is 14%. b. Determine the coefficient of determination is .095 c. Can we conclude that
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types Experimental - uses independent (random‚ representative‚ etc.) vs. dependent (observed outcomes)‚ free of confounds. Make causal claims about why things happen‚ prevent bad stuff‚ promote good stuff. “experiments" Correlational - descriptive‚ observational. Does not make causal claims. “studies" Variable types (SS Stevens‚ 1946) Nominal - assign item to category; are discrete / categorical Ordinal - rank order items; are categorical‚ but often treated as continuous
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Descriptive Statistic Article Critique Liza Fisher PSY325/ Statistics for the Behavioral & Social Sciences Instructor: Thomas King May 23‚ 2015 Descriptive Statistic Article Critique The author was trying to say that men who consume an enormous amount of alcohol every day and who is stable socially do not have a different personality‚ than those men who are socially stable and do not drink alcohol. In this article the hypothesis is that individual males who consume a great deal of
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In this descriptive essay I would like to tell you about my favorite object. One of the most important objects to me is my baseball bat that I spend almost my entire summer using. It is a Louisville Slugger baseball bat. It is my favorite object because I’ve had it for one year and have used it a lot of times in games and practices. I have never hit any home runs or anything but have helped my team out with big hits when they were needed. This bat is an orange and yellowish color. This bat is
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Producing and Interpreting Descriptive Statistics Lutricia Hunter Capella University MBA6018: Data Analysis for Business Decisions January 18‚ 2015 Unit 1: Assignment 1 For this practical application assignment‚ make believe that you are a real estate agent living and working in southern Florida. The senior real estate partner of your firm e-mails you a document containing Florida pool home data‚ which you’ve retrieved from the Updates and Handouts section of this unit‚ and asks you to find
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