harvard A Newsletter from Harvard Business School Publishing management update ARTICLE REPRINT NO. U0603C The Use and Misuse of Statistics For a complete list of Harvard Business School Publishing newsletters: http://newsletters.harvardbusinessonline.org For reprint and subscription information for Harvard Management Update: Call 800-988-0866 or 617-783-7500 http://hmu.harvardbusinessonline.org For customized and quantity orders of reprints: Call 617-783-7626 Fax 617-783-7658
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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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Writing a Research Proposal 1. Title page a. title should provide a clear idea of the research topic b. has student’s name and ID# c. student’s major d. course name e. professor’s name f. date 2. Table of Contents (covered in point# 9). 3. Write an introductory chapter (includes Introduction‚ Importance of Study‚ Purpose of Study‚ Background‚ Assumptions‚ Delimitations) • Present an overview of the research study. o Explain why the topic
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manager requested estimates of the mean selling price of Gulf View condominiums with a margin of error of $40‚000 and the mean selling price of No-Gulf View condominiums with a margin of effort of $15‚000. Using 95% confidence‚ how large should the sample sizes be? GULF VIEW CONDOMINIUMS List Price Sales Price Days to Sell 495000 475000 130 379000 350000 71 529000 519000 85 552500 534500 95 334900 334900 119 550000 505000 92 169900 165000 197 210000 210000 56
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1.0 Executive Summary From the findings of our research we have arise few issues for Peppercorn Café: It is important for the cafes to provide good customer service that can satisfy customer needs therefore this strategy can provide communication between the retailer and its customer. Furthermore‚ the retailer in order to be able to communicate with customer could provide feedback forms where it can represent the voice of its customer whilst maintain confidentiality. Apart from that the store
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TCO D) PuttingPeople2Work has a growing business placing out-of-work MBAs. They claim they can place a client in a job in their field in less than 36 weeks. You are given the following data from a sample. Sample size: 100 Population standard deviation: 5 Sample mean: 34.2 Formulate a hypothesis test to evaluate the claim. (Points : 10) Ho: µ = 36; Ha: µ ≠ 36 Ho: µ ≥ 36; Ha: µ < 36 Ho: µ ≤ 34.2; Ha: µ > 34.2 Ho: µ > 36; Ha: µ ≤ 36 Ans. b. H0 must always have equal sign‚ <
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What is the probability that a picture tube will last more than 10 yrs? (ii) If the firm guarantees the picture tube for 4 yrs‚ what percentage of the tubes sold will have to be replaced? 4. Make a list of formulae for all confidence intervals‚ sample size determination and tests of hypothesis that you have read in your study material. 5. What is a time – series? Discuss four components of a time – series. Why is it generally assumed that the impact of these components is multiplicative?
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distribution of sample means will be normal if either the population is normal or if the sample size is greater than 30. Increasing the alpha level (for example‚ from α=0.01 to α= 0.05) Increases the probability of a Type I error. Increases the size of the critical region. Increases the probability that the sample will fall into the critical region. Samples of size n = 16 are selected from a population with μ= 80 with σ= 16. What is the standard error for the distribution of sample means? 4 The Intelligence
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Unit 3 – Survey Sample Size Yvonne Johnson American InterContinental University Abstract This essay will have two parts one will discuss three different surveys and the second will be a survey that was performed by the author. The subjects of the surveys will be Entertainment‚ Political‚ and General. We will analyze the surveys that do not have the population that were surveyed. Introduction The entertainment survey will be a survey that was conducted by Universal UK‚ was conducted
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pounds. A random sample of 50 people who joined the new weight reduction program revealed the mean loss to be 9 pounds. At the .05 level of significance‚ can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p-value. 32. Dole Pineapple‚ Inc.‚ is concerned that the 16-ounce can of sliced pineapple is being overfilled. Assume the standard deviation of the process is .03 ounces. The quality control department took a random sample of 50 cans and found
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