Statistics Practical 2a Comments on Z-tests and t-tests 1. You should have realized from the lectures that in practice, a z-test is seldom used, while the ‘default’ test for single sample or two-samples mean(s) is the ttest. This is because in most practical situations, the population variance is seldom known and therefore we need to estimate that by the sample variance, thus justifying a t-test rather than a z-test. It is always good to perform the standard exploratory data analysis before commencing
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to Construct a Confidence Interval Instructions on the left Instructions on the right pertain to means pertain to proportions 1. POPULATION a. Identify the parameter of interest: π : proportion µ : Mean Numerical (Measurement) Categorical (success-failure) b. Describe the variable in context with the problem: µ = mean of the amount of drying time of a particular paint. π = proportion of people in the community who prefer smoking 2. STATISTICAL METHOD a. Determine the confidence level (1 - α) and
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Hassan, Ruman Ul February 17, 2014 GESP Writing2, Villamater Writing Journal 5 Student Progress In the current society, progress of an individual is interpreted at many different levels. Some assume it to be a matter of exchanging from one problem to another and some assume that it is reaching towards the success from one level to another. However, the individual’s progress can be easily illustrated by their efforts made in attaining the success from one level to another. Similarly, the progress
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Connor Osborne IDS 1010 11-5-14 Detailed Outline & Main Point Revised Thesis Statement Online dating comes with the high possibility of getting involved with different types of fraud accounts. Detailed Outline I. Intro A. Thesis Statement B. Fraud Account Characteristics C. Scams From Fraud Accounts D. Romance Scams II. To avoid fraudulent activity online daters must be aware of the characteristics of these fake accounts. A. Over Romantic a. Take things
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Casa 2-4 Spyware can be good but also bad so we are going to compare the good vs. the bad. The definition of spyware is a program that is install into your computer and gathers information wether for good or bad reasons. Lets talk about legitimate spyware and there are many. For example, Cookies: computers automaticly have cookies to track were you been and it records its. For business side it a good idea to have cookies because it can tell you whether the person is on or how many times
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Report case of Bernard Madoff’s Ponzi Scheme. I. Nature and background of firm or person. * Bernard Lawrence "Bernie" Madoff was born in April 29, 1938. He is an American swindler convicted of fraud and a former stockbroker, investment advisor, and financier. He is the former non-executive chairman of the NASDAQ stock market. * This financial fraud admitted case of a Ponzi scheme that is considers be the largest financial fraud in U.S history. II. Ethical issue * Since the arrest
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possible bootstrap sample? Explain why it wouldn’t be. a) 48, 55, 43, 61, 39 b) 43, 39, 56, 43, 61 c) 55, 48, 55, 48, 61 d) 39, 39, 39, 39, 39 2. The following bootstrap output is for mileage of a random sample of 25 mustang cars. Based on a 90% confidence interval, which of the following would not be a plausible value of the population mean, µ? Explain why it wouldn’t be. a) 60.01 b) 80.01 c) 55 d) 52 3. Which of the following p-values would provide more evidence in support of the alternate hypothesis
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Question: In a poll of 600 voters in a campaign to eliminate non-returnable beverage containers, 210 of the voters were opposed. Develop a 92% confidence interval estimate for the proportion of all the voters who opposed the container control bill. Answer: 92% of confidence interval (CI) for p is given by p±Z0.08 √(pq/n) Here, p= 210/600= 0.35 q= (1-p) = 0.65 Z0.08 = 1.75609 n= 600 Hence, CI is 0.35±1.75609 √((0.35*0.65)/600) = 0.35±0.03409 (0.31591,0.38409) Question: A random sample
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In a Word document, write a two to three (2-3) page report in which you: Calculate the mean, median, and standard deviation for ounces in the bottles. Round your final results to 3 significant places after the decimal. Construct a 95% Confidence Interval for the ounces in the bottles. Round your final results to 3 significant places after the decimal. Conduct a hypothesis test to verify if the claim that a bottle contains less than sixteen (16) ounces is supported. Use 0.02 as the level
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BA 310 Case Study #1 In any business instances whether it be directly dealing with money, or any type of contract or agreement it is imperative to have trust between the two parties. This is to ensure that the process is successful and handled correctly. In the case study Madoff gained an insane amount of investors by promising them they would have a guaranteed return on their investment. Later on, the investors figured out that the money they invested was
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