Statistics Homework I have to answer 1 question to my teamStatistics HomeworkI have to answer 1 question to my team assignment. The question isWhat percent of the Saturday deliveries would result in a customer receiving a free order?I will attach the spreads… read more
Ryan
Bachelor's Degree
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I need the answer to the questions: 1. A consultant for Dell1. A consultant for Dell was investigating computer usage among students at a particular university. 200 undergraduates and 100 postgraduates were chosen and asked if they owned a laptop. It was found that 81 of the undergraduates and 63 of the postgraduates owned a laptop. The consultant calculated that 48% (144 out of 300) of the students interviewed owned a laptop. Explain, with reasons, whether the figure of 48% would be a good estimate of the proportion of all students who own a laptop. Hint: The answer is ‘Well James, it depends!', but obviously reasons are required! (10 marks) 2. A 95% confidence interval for the mean income of shop assistants in a certain city, based on a random sample of n shop assistants, is found to be (£18,000, £21,000). Explain what this means briefly (in at most 2–3 sentences). Would a 90% confidence interval be better than a 95% confidence interval? Justify your answer. Hint: The answer is ‘Well James, it depends!', but obviously reasons are required! (10 marks) 3. For a certain variable, the standard deviation in a large population is equal to 16. How large a random sample is needed to be 99% confident that the sample mean is within 2 units of the population mean? Would you recommend a confidence level other than 99%? Hint 1: Use the confidence interval Excel utility. Hint 2: The answer is ‘Well James, it depends!', but obviously reasons are required! (10 marks) 4. An accounting firm wishes to test the claim that no more than 6% of a large number of transactions contain errors. In order to test this claim, they examine a random sample of 225 transactions and find that exactly 20 of these are in error. What conclusion should the firm draw? Use a 5% significance level. Hint: Use the hypothesis testing Excel utility (one population). 5. Explain (in no more than a paragraph for each) the purpose of: (a) sampling (b) hypothesis testing. Discuss any advantages and limitations of each. 2 (10 marks) (10 marks) 6. A lumber company makes plywood for the furniture industry. One product it makes is 3/4-inch panels. It is very important that the panels conform to specifications. One specification calls for the panels to be made to an average thickness of 0.75 inches. Each hour, 5 panels are selected at random and measured. After 20 hours, a total of 100 panels have been measured (so the sample size is n = 100). The data are in the file ‘Lumber.xls'. (a) Based on the sample data, what should the company conclude about the status of its product meeting the thickness specification? Test at a 1% significance level. Discuss your results in a brief ‘executive summary' to the production manager. Hint: Use the hypothesis testing Excel utility (one population). (b) The production manager has looked at the results of your test. He wishes to repeat this sampling process and wants a rule to compare future X ̄ values only. So, based just on a sample mean of any new random sample of panels, without having to conduct a formal hypothesis test, he wishes to decide whether the thickness specification is being met, again using a 1% significance level. Develop a suitable rule. Hint: Use the hypothesis testing Excel utility (one population). (c) The manager wishes to know what type of error in (a) could have been made and what the potential consequences of the error might be. (25 marks) 7. A bookstore samples its order record to examine the number of days between placing an order and receiving the goods. The results (in days) are shown below. Assess and comment on the differences between surface transportation and air freight. You may use Excel! The data are in the file ‘Bookstore.xls'. Hint: This question is deliberately open-ended. You may investigate the data any way you like, for example calculating some descriptive statistics. Surface transportation 18 20 24 23 28 32 24 39 18 29 25 27 19 24 21 19 24 27 33 37 15 20 26 21 17 26 25 23 25 35 Air freight 12 12 13 21 18 14 9 16 18 14 13 11 15 11 17 14 12 13 11 17 19 16 14 14 12 … read more
F. Naz
Bachelor's Degree
CA Finalist & Completed B.com
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Score: Week 4 Confidence Intervals and Chi Square (Chs 11Score: Week 4 Confidence Intervals and Chi Square (Chs 11 - 12) For questions 3 and 4 below, be sure to list the null and alternate hypothesis statements. Use .05 for your significance level in making… read more
Mr. Gregory White
Master's Degree
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9.After a series of major corporations admitted to large9. After a series of major corporations admitted to large accounting irregularities, a public policy research institute conducts a survey to determine whether the public favors increased governmental … read more
SusanAthena
Master's Degree
Master's Degree
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I see that you have already answered these problems for someoneI see that you have already answered these problems for someone else and I would like to see if you could answer these questions for me. Coladarci text Chapter 14: Exercises 2, 4, 8, 9, 12, 16 Chapter… read more
Trigeoscal
College Math Professor
Master's Degree
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9. After a series of major corporations admitted to large9. After a series of major corporations admitted to large accounting irregularities, a public policy research institute conducts a survey to determine whether the public favors increased governmental … read more
R.R. Jha
Bachelor's Degree
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RRJha, I need the Module 7 work we discussed. FollowingRRJha, I need the Module 7 work we discussed. Following is the format that the professor has said we must use to report the data (7 steps for each question). Thank you. Reporting Results Step 1: State… read more
R.R. Jha
Bachelor's Degree
6,909 satisfied customers
It is recommended that people try to keep their cholesterolIt is recommended that people try to keep their cholesterol level below 200. The following Minitab output is for the control patients: test of mu = 200.00 vs mu < 200.00 Variable N Mean StDev SE Me… read more
R.R. Jha
Bachelor's Degree
6,909 satisfied customers
for business tutor 1.in a study of crime, the FBI foundfor business tutor: 1.in a study of crime, the FBI found that 13.2% of all Americans had been victims of crime during a 1-years period. this result was based on a sample of 1,105 adult a. Estimate the… read more
Expert
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I need statistical verifaction of a process I have developed.I need statistical verifaction of a process I have developed. I have a company with a online store locator. I need to select a sample of the stores from this locator and obtain an average drive time b… read more
SusanAthena
Master's Degree
Master's Degree
13 satisfied customers
. A recent survey of 50 executives who were laid off from. A recent survey of 50 executives who were laid off from their previous position revealed it took a mean of 26 weeks for them to find another position. The standard deviation of the sample was 6.2 we… read more
SuperiorTutor
Bachelor's Degree
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