a)
To determine: The percentage spent in working, through observation
Introduction:
b)
To determine: The required sample size
Introduction: Sample size is required to determine the number of observations that are necessary to find the true cycle time.
c)
To determine: Whether the sample size taken by the assistant is adequate or not
Introduction: Sample size refers to the number of observations that are necessary to determine the cycle time. The major goal of sample size is to determine inferences about the population from the observations.
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- a) A machine is set to produce a diameter of 9 mm nominal, and a sample of five pieces is taken every hour, Table 3(a). Over the first 10 samples the following results were obtained; 1 2 3 4 5 6 8 9 10 Sample No. 9.05 9.05 9.04 9.04 9.06 9.06 9.04 9.06 9.05 9.03 9.03 9.04 9.05 9.04 9.04 9.04 9.07 9.03 9.05 9.06 9.03 9.06 9.04 9.04 9.05 9.05 9.06 9.03 9.05 9.04 9.04 9.04 9.06 9.05 9.05 9.04 9.06 9.04 9.06 9.05 9.06 9.05 9.04 9.04 9.06 9.04 9.05 9.05 9.05 9.03 Table 3(a) i. Calculate the control limits for this process ii. Graph the sample data for both the X-bar and R-bar charts. iii. Explain if this machine is adjusted and in control? From the information in Table 3(a), estimate the standard deviation of the process, ô . iv.arrow_forwardFour samples of three observations each have been taken. Sample 1: 12.3, 12, 12.1. Sample 2: 11.9, 12, 12.7. Sample 3: 12, 12.2, 11.8. Sample 4: 11.9, 11.8, 11.8. LCL and UCL of X-bar chart are: O a. None of them Ob. 11.74 and 12.36 O C. 3.23 and 3.56 d. 12.00 and 13.24 O e. 11.63 and 12.45arrow_forwardTime left 1:06:0- In a fabric manufacturing factory, the quality control process using control charts from SPC. In an hour there are a total of 5 samples are taken each having 4 observations regarding the thickness of fabric in measured in millimeters. In a particular hour, the sample means (X-bar) are noted to be: 156.46, 199.62, 189.31, 102.22, and112.09 respectively. In the same sample, the corresponding ranges are: 11.97, 12.17, 13.94, 11.86, and 11.83 respectively. What are the lower and upper control limits for the R chart? O a. 0,28.17 O b. 0,31.17 OC None is correct O d. 0,24.71 O e. 0,30.47 Of. 0,29.17 US PAGE NEXT PAGE O # C a pe here to search Prt F10 F12 %23 & 2 . 3 5 6 V. 8. R T. Y U P 41 S F J G y H K L / C V } BYN i 10 Alt Alt Ctrlarrow_forward
- erations Management Spring21 Time left 1:09:19 stion In a fabric manufacturing factory, the quality control process using control charts from SPC. In an hour there are a total of 5 samples are taken each having 5 observations regarding the thickness of fabric in measured in millimeters. In a particular hour, the sample means (X-bar) are noted to be: 156.46, 199.62, 189.31, 102.22, and112.09 respectively. In the same sample, the corresponding ranges are: 11.97, 12.17, 13.94, 11.86, and 11.83 respectively. What are the lower and upper control limits for the X-bar chart? et ered ed out of O a. None is correct lag O b. 156.55, 170.47 tion O C. 144.77, 159.11 O d. 145.40, 190.72 O e. 143.55, 165.47 Of. 142.92, 160.66 Fi PREVIOUS PAGE NEXT PAGE O Type here to search %23arrow_forwardQuestion 1 This Test: 60 pts possible Submit Test Daily high temperatures in St. Louis for the last week were as follows: 92, 92, 94, 94, 95, 88, 95 (yesterday). a) The high temperature for today using a 3-day moving average = degrees (round your response to one decimal place). b) The high temperature for today using a 2-day moving average = degrees (round your response to one decimal place). c) The mean absolute deviation based on a 2-day moving average = degrees (round your response to one decimal place). %3D d) The mean squared error for the 2-day moving average = degrees (round your response to one decimal place). e) The mean absolute percent error (MAPE) for the 2-day moving average = % (round your response to one decimal place).arrow_forwardPlease use the following information to answer the following questions Alpha=0.05, Beta=D0.01, LTPD=0.3 , AQL=0.05 Question 8. What is the cut off point? 66arrow_forward
- Instruction: Prepare a check sheet to analyze the data below from customer complaints, then prepare a list of recommendations that will address these complaints. Case: Tip Top Markets Tip Top Markets is a regional chain of supermarkets located in the southeastern United States. Karen Martin, manager of one of the stores, was disturbed by the large number of complaints from customers at her store, particularly on Tuesdays, so she obtained complaint records from the store’s customer service desk for the last nine Tuesdays. June 1 out of orange yogurt produce not fresh bread stale lemon yogurt past sell date checkout lines too long couldn’t find rice overcharged milk past sell date double charged stock clerk rude meat smelled strange cashier not friendly charged for item not purchased out of maple walnut ice cream couldn’t find the sponges something green in meat meat tasted strange didn’t like music store too cold…arrow_forwardsubject : quality control topic: six sigma The increased global manufacturing competition forces many organizations to adapt quality tools and techniques in order to survive in the modern marketplace. Find and choose a real case study of the organization of your own choice (such as healthcare, IT-industry, automobile, chemical etc.) and critically analyzed how these organization reduced their product defects and reduced cost using six sigma methodology.arrow_forwardK Claudine Soosay recorded the following times assembling a watch: Observation No. 1234567co 8 Time (minutes) 0.12 0.10 0.11 0.11 0.15 0.10 0.10 0.10 Observation No. 9 10 11 12 13 14 15 16 Time (minutes) 0.11 0.08 0.11 0.10 0.10 0.11 0.14 0.08arrow_forward
- Four samples of three observations each have been taken, with actualmeasurements (in centimeters) shown below. Construct x bar and R charts, and determine ifthe production process is under control. Samples 1 2 3 4 12.3 11.9 12.0 12.1 12.2 12.2 12.2 11.8 12.1 12.2 11.8 11.8arrow_forwardQUESTION 6 In a burger shop, a sample of 36 days, was taken to study the daily sales, It was found that the mean daily sales are (m) with a standard deviation is (d). The confidence interval for the population mean is computed, the upper confidence limit is 35, and the lower confidence limit is 18 Calculate the value of m? (Round answer to two decimal places ex. 2.09)arrow_forwardQUESTION 1 My Happy Feet Company manufactures athletic shoes. The company wants to establish a p chart to monitor the production process using Z=3.00. The company has taken a sample of 50 shoes every 4 hours for a work week of five days. Since the company runs two 8-hour shifts each day, this will result in 20 samples. The sample results are as follows. Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Number of Defectives 0 1 0 3 2 5 3 2 1 0 4 1 1 2 2 3 4 1 5 2 23.00 Answer these questions: a. Construct a p-chart to monitor this process. b. Plot the p-chart graph. c. indicate if the process was out of control at any timearrow_forward
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