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- Your twenty observations of Dr. Knowitall reveal the following information. Assume that the estimate is to be within 5 percent of the true proportion 96 percent of the time Activity Observed Number of Times Observed With patient 6 Reviewing test results 5 On phone 5 Idle 3 Away on emergency 1 Not available 1 Total 21 Calculate the sample size needed to estimate the proportion of time Dr. Knowitall spends away on emergencies.At Quick Car Wash, the wash process is advertised to take less than 7 minutes. Consequently, management has set a target average of 390 seconds for the wash process. Suppose the average range for a sample of 10 cars is 11 seconds. Part 2 The UCL Subscript Upper R equals seconds and the LCL Subscript Upper R equals seconds. (Enter your responses rounded to two decimal places.)Management at Deluxe Diner is in process of establishing a quality control system for the time it takes to initially make contact with a table of patrons. A sample of size 3 is taken on each of the five different days. The following data table presents the results (all times listed are in seconds). Time 1 Time 2 Time 3 Service Encounter day 1 day 2 day 3 day 4 day 5 200 120 83 68 110 150 85 93 150 90 175 105 130 145 75
- The Money Pit Mortgage Company is interested in monitoring the performance of the mortgage process. Fifteen samples of five completed mortgage transactions each were taken during a period when the process was believed to be in control. The times to complete the transactions were measured. The means and ranges of the mortgage process transaction times, measured in days, are as follows: Sample Mean Range ew an example 1 2 16 12 7 12 Get more help. 3 6 5 4 5 6 7 8 9 15 10 10 13 14 11 9 10 16 13 16 11 Subsequently, samples of size 5 were taken from the process every week for the next 10 weeks. The times were measured and the following results obtained: D Sample Mean Range 16 9 8 17 12 12 18 19 13 7 7 5 20 15 13 MacBook Pro Click the icon to view the table of factors for calculating three-sigma limits for the x-chart and R-chart. a. Construct the control charts for the mean and the range, using the original 15 samples. Set up the R-chart by specifying the center line and three-sigma control…As part of an insurance company’s training program, participants learn how to conduct an analysis of clients’ insurability. The goal is to have participants achieve a time in the range of 30 to 45minutes. Test results for three participants were: Armand, a mean of 38 minutes and a standarddeviation of 3 minutes; Jerry, a mean of 37 minutes and a standard deviation of 2.5 minutes; andMelissa, a mean of 37.5 minutes and a standard deviation of 1.8 minutes.a. Which of the participants would you judge to be capable? Explain.b. Can the value of the Cpk exceed the value of Cp for a given participant? Explain.A quality inspector took five samples, each with four observations (n = 4), of the length oftime for glue to dry. The analyst computed the mean of each sample and then computed thegrand mean. All values are in minutes. Use this information to obtain three-sigma (i.e., z = 3)control limits for means of future times. It is known from previous experience that the standard deviation of the process is .02 minute.SAMPLE1 2 3 4 51 12.11 12.15 12.09 12.12 12.09Observation 2 12.10 12.12 12.09 12.10 12.143 12.11 12.10 12.11 12.08 12.134 12.08 12.11 12.15 12.10 12.12¯X 12.10 12.12 12.11 12.10 12.12
- Using the proper control chart, determine two-sigma control limits for the situation below. a. An examiner found an average of 4.9 scratches in the outer paint of each of the vehicles being made for delivery to dealers. b. Before delivery of lawn mowers to dealers, an examiner tries to start each mower and notes any that do not start on the first try. The lot size is 200 mowers, and an average of 5 did not start (2.5 percent)Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of n = 20 observations have been obtained and the sample means and ranges computed: Sample Mean Range 1 3.06 .42 2 3.15 .50 3 3.11 .41 4 3.13 .46 5 3.06 .46 6 3.09 .45 Using the factors in Table 10.3 , determine upper and lower limits for mean and range charts. Is the process in control?When plotting a process, with the intention of monitoring trends, which of the following apply? Select one: a. An increase in the mean and a decrease in variation is desirable b. A decrease in both the mean and variation is desirable c. The optimum mean may be lower or higher than current values d. The mean is not as important as the variation
- Management of Mittel Rhein AG of Köln, Germany, would like to reduce the amount of time between when a customer places an order and when the order is shipped. For the first quarter of operations during the current year the following data were reported: Inspection time- 0.7 daysWait time (from order to start of production) -16.6 daysProcess time -2.7 daysMove time -1.3 daysQueue time- 4.5 daysRequired:1. Compute the throughput time. (Round your answer to 1 decimal place.) 2. Compute the manufacturing cycle efficiency (MCE) for the quarter. (Round your answer to the nearest whole percentage (i.e., 0.12 should be entered as 12).) 3. What percentage of the throughput time was spent in non–value-added activities? (Round your answer to the nearest whole percentage (i.e., 0.12 should be entered as 12).) 4. Compute the delivery cycle time. (Round your intermediate calculations and final answer to 1 decimal place.) 5. If by using Lean Production all queue…Suppose a manufacturing process produces small metal rods. The desired length of these rods is 50 cm. Quality control personnel take samples of 5 rods every hour and measure their lengths. After 8 hours, they have the following data for the average lengths (in cm) of the 8 samples: Hour (h): 1, 2, 3, 4, 5, 6, 7, 8Average Length (X-bar): 49.8, 50.2, 50.1, 49.9, 50.3, 50.1, 49.7, 50.0 Additionally, the standard deviation (s) for each sample is provided: Hour (h): 1, 2, 3, 4, 5, 6, 7, 8Standard Deviation (s): 0.1, 0.12, 0.11, 0.1, 0.12, 0.11, 0.09, 0.1 Based on the given data, is the process under control?The normal time for the overall process ____? minutes (round your response to two decimat places) The standard time for this process ____? minutes (round your response to two decimal places) The number of observations that are required for a 99% confidence level within 5 % accuracy ____? observations (round your response to the immediate higher whole number)