Problem set 3 Crystal Yu 1. Do problem 4.8 and 4.9 page 149 (2 points) You need to show your work to get credit. 4.8 Does it take more time to be removed from an email list than it used to take? A study of 100 large online retailers revealed the following: Need Three Or More Clicks to Be Removed Year Yes No Total 2009 39 61 100 2008 7 93 100 46 154 200 a. Give an example of a simple event Need less
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Have you ever wanted to stay away from people who have a mental disability? In the book‚ The Curious Incident of The Dog in The Night-time by Mark Haddon‚ Christopher has a serious condition of Asperger’s syndrome‚ but is still really intelligent. Autism can be beneficial to autistic people because it can help them be more confident and express themselves however they please. They understand the differences between them and others and they don’t allow people’s thoughts and opinions to sway them.
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circle the correct answer. 1. When s is used to estimate (‚ the margin of error is computed by using a. normal distribution b. t distribution c. the mean of the sample d. the mean of the population Answer: b 2. As the number of degrees of freedom for a t distribution increases‚ the difference between the t distribution and the standard normal distribution a. becomes larger b. becomes smaller c. stays the same d. None of these alternatives is correct
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Assignment Week 1 Answer the following questions: 1. Describe the rationale for utilizing probability concepts. For practical reasons‚ variables are observed to collect data. The sampled data is then analyzed to elicit information for decision making in business and indeed in all human endeavors. However‚ sampled information is incomplete and not free from sampling error. Its use in decision-making processes introduces an element of chance. Therefore‚ it is important for a decision-maker
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Page 2 Chapter Contents ¡ P.1 Random Variables ¡ P.2 Probability Distributions ¡ P.3 Joint‚ Marginal and Conditional Distributions ¡ P.4 A Digression: Summation Notation ¡ P.5 Properties of Probability Distributions ¡ P.6 The Normal Distribution Principles of Econometrics‚ 4th Edition Probability Primer Page 3 1 1/08/13 P.1 Random Variables Principles of Econometrics‚ 4th Edition Probability Primer Page 4 P.1 Random Variables !
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Tdistributions-test to see if variable A = variable B interval/ratio data/normal curve either they = each other or they do not-Mean of A/ Mean of B 2 tailed test is easier but yields less information than 1 tail Explanatory variable-explaining variable Week 3 Quiz Chapters 4‚ 5‚ 6 Study Reading from Week 2 Standard Deviation convert to percentages Normal Distribution? Rule for normal distribution. (MEMORIZE) Chapter 5 Normal distribution illustrating the 68%-95%-99.7% About 68% of the values
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Stats: Modeling the World - Bock‚ Velleman‚ & DeVeaux Chapter 1: Stats Starts Here Chapter 2: Data Key Vocabulary: Statistics data‚ datum variation individual respondent subject participant experimental unit observation variable categorical quantitative Calculator Skills: enter data in a list change a datum delete a datum name a new list clear a list delete a list recreate a list copy a list 1. Name three things you learned about Statistics in Chapter 1. 2. The authors claim
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not always the case. Some examples of distributions that aren’t normal are incomes in a region that are skewed to one side and if you need to are looking at people’s ages but need to break them down to for men and women. We need a way to look at the frequency distributions of these examples. We can find them by using the Central Limit Theorem. The Central Limit Theorem states that random samples taken from a population will have a normal distribution as long as the sample size is sufficiently large
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Six Sigma Quality at Flyrock Tires Executive Summary The process of creating tires at Flyrock Tires involves 20 different steps to take the rubber from bales to final curing. Given this complexity and the high production volume (the factory produces about 10‚000 tires per hour)‚ it takes only a small margin of error in each of these steps to begin to compound and result in a high defective rate. For both public safety and their reputation‚ Flyrock strives to minimize the number of defects. The
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(1)Financial assets are expected to generate cash flows and hence the riskiness of a financial asset is measured in terms of the riskiness of its cash flows. (2)The riskiness of an asset may be measured on a stand-alone basis or in a portfolio context. An asset may be very risky if held by itself but may be much less risky when it is a part of a large portfolio. (3)In the context of a portfolio‚ the risk of an asset is divided into two parts: diversifiable risk (unsystematic risk) and market risk
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