SOLVED

41) A manager wishes to build a 3-sigma range chart for a process. The sample size is five, the mean of sample means is 16.01, and the average range is 5.3. From Table S6.1, the appropriate value of D3 is 0, and D4 is 2.115. What are the UCL and LCL, respectively, for this range chart? A) 33.9 and 11.2 B) 33.9 and 0 C) 11.2 and 0 D) 6.3 and 0 E) 31.91 and 0.11 42) Plots of sample ranges indicate that the most recent value is below the lower control limit. What course of action would you recommend? A) Since there is no obvious pattern in the measurements, variability is in control. B) One value outside the control limits is insufficient to warrant any action. C) Lower than expected dispersion is a desirable condition; there is no reason to investigate. D) The process is out of control; reject the last units produced. E) Variation is not in control; investigate what created this condition. 43) To set x-bar chart upper and lower control limits, one must know the process central line, which is the: A) average of the sample means. B) total number of defects in the population. C) percent defects in the population. D) size of the population. E) average range. 44) According to the text, what is the most common choice of limits for control charts? A) ±1 standard deviation B) ±2 standard deviations C) ±3 standard deviations D) ±3 standard deviations for means and ± 2 standard deviations for ranges E) ±6 standard deviations 45) Which of the following is true of a p-chart? A) The lower control limit is found by subtracting a fraction from the average number of defects. B) The lower control limit indicates the minimum acceptable number of defects. C) The lower control limit equals D3 times p-bar. D) The lower control limit may be at zero. E) The lower control limit is the same as the lot tolerance percent defective. 46) The normal application of a p-chart is in: A) process sampling by variables. B) acceptance sampling by variables. C) process sampling by attributes. D) acceptance sampling by attributes. E) process capability ratio computations. 47) What is the statistical process chart used to control the number of defects per unit of output? A) x-bar chart B) R-chart C) p-chart D) AOQ chart E) c-chart 48) The c-chart signals whether there has been a: A) gain or loss in uniformity. B) change in the number of defects per unit. C) change in the central tendency of the process output. D) change in the percent defective in a sample. E) change in the AOQ. 49) The local newspaper receives several complaints per day about typographic errors. Over a seven-day period, the publisher has received calls from readers reporting the following total daily number of errors: 4, 3, 2, 6, 7, 3, and 9. Based on these data alone, what type of control chart(s) should the publisher use? A) p-chart B) c-chart C) x-bar chart D) R-chart E) x-bar chart and R-chart 50) A manufacturer uses statistical process control to control the quality of the firm’s products. Samples of 50 of Product A are taken, and a defective/acceptable decision is made on each unit sampled. For Product B, the number of flaws per unit is counted. What type(s) of control charts should be used? A) p-charts for both A and B B) p-chart for A, c-chart for B C) c-charts for both A and B D) p-chart for A, mean and range charts for B E) c-chart for A, mean and range charts for B