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I need the answer to the questions: 1. A consultant for Dell
1. 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
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You guys already have the answers can i get it, • Exercises:
• Exercises: 7.2 and 7.6 The following exercises are required and cover topics in this week's required reading. Review the instructions carefully before completing and submitting the exercises.Complete Exercises 7.2 and 7.6 on pages 183 and 185 in Quantitative Methods in Health Care Management. Use the Excel document below to record your answers. Save the template to your desktop before using. Excel template for Exercises 7.2 and 7.6Exercise 7.2: Utilize the information from exercise 6.2, where pre-and post-examination processing of patients in an outpatient clinic involves various tasks performed by clerks and nurses. a. Excluding the wait times by patients, recalculate the standard time.b. If there were an average of 1,800 patient visits to the outpatient clinic, what would be the standard hours per month?c. If the target utilization rate of the facility is 80 percent; the indirect support time per visit is 0.10 hour, and the total administrative time by all staff in a given day is five hours, what is the target FTE level for the clinic?d. If fringe benefits account for 9 percent of the target FTEs, what are the required FTEs?For 7.6 c, Use the following: Calculation of "Coverage Factor" for 10/40 plan Required coverege day per year 365 Weekend day per year 156 Holidays 10 Sick day 6 Vacation day 15Exercise 7.6: Table Ex. 7.6 depicts the average RN minutes needed on a daily basis in various units.TABLE EX. 7.6 ICU CCU SURG MED PED OB/GYN 7,000 8,000 8,500 9,000 7,500 6,500 a. Assuming an 85 percent utilization level and that everything else is constant, how many RN FTEs should be hired to satisfy the patient care demand in each unit?b. The FTEs hired for SURG, MED, PED, and OB/GYN are scheduled for eight-hour shifts on 5/40 plan, and they will get ten holidays, six sick days, and fifteen paid vacation days per year. How does this information affect your FTEs?c. The FTEs hired for the ICU and CCU are to be scheduled for ten-hour shifts on a 4/40 plan, and ICU and CCU nurses get the same benefits as do other unit nurses. How does this information affect your FTEs?• Week 4 Exercise AssistanceExercises can be found in the reading. All page numbers refer to Quantitative Methods in Health Care Management: Exercise 7.2 a: Formula 6.6, p. 130, using 12% as allowance level, as shown on p. 131. Exercise 7.2c: Use Table 7.6, p. 174 Exercise 7.6 a: Formula 7.1, p. 175 Exercise 7.6 b: Formula 7.4, p. 176Exercise 7.6 c: same as 7.6b. Refer to Table 7.7, p, 177 as model For 7.6b, use the following: Calculation of "Coverage Factor" for 5/40 planRequired coverage day per year 365 Weekend day per year 104 Holidays 10 Sick day 6 Vacation day 15 Exercise 6.2Exercise 6.2: Pre- and post- examination processing of patients in an outpatient clinic involves various tasks performed by clerks and nurses. A time study conducted by the decision support department is shown in Table EX 6.2. a. Determine the observed time for the pre-post exam process.b. Determine the normal time for the pre-post exam process.c. Determine the standard time for the pre-post exam process, using the basic-moderate allowance for the job.d. Calculate the standard time for the exam process. Do you think the time spent in the outpatient clinic, without including the exam time, is reasonable? If not, what improvements would you recommend?TABLE EX 6.2 Observations (in Minutes)PerformanceActivity Rating 1 2 3 4 5 6 7 8 9 10 11 Registration 1.15 3 6 4 8 4 5 4 6 4 6 4 Copayment 0.95 7 9 11 8 12 9 6 11 9 12 10 Wait for nurse 1.00 17 15 17 12 11 17 12 19 12 20 18 Vital signs 0.96 9 8 11 12 9 8 10 12 8 12 11 Wait for exam room 1.00 12 15 12 14 21 18 11 16 9 14 18 Placement to exam room 0.98 3 5 4 6 3 5 3 6 5 4 7 Wait for physician 1.00 10 17 21 11 13 15 14 12 19 15 9 Examination 1.00 18 15 19 22 18 12 19 21 16 21 17 Test order entry 1.02 4 7 3 5 4 11 9 12 11 14 9 Referral requests 1.11 11 10 16 9 8 9 7 7 9 7 6 Follow-up appointment sch… read more
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