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ods333 chapter 17




Question;TRUE or FALSE;28. T F It;is impossible to develop a process that has zero variability.;29. T F;Assignable variations in a process are also called natural variations.;30. T F An;x-bar chart would be appropriate to monitor the number of defects in;a;production lot.;31. T F The;central limit theorem provides the statistical foundation for control;charts.;32. T F If;we are tracking quality of performance for a class of students, we should;plot;the pass/fail result on a p-chart.;33. T F;Sample sizes of five (5) are often used when building control charts.;34. T F If;we are attempting to control the diameter of bowling balls, we will find;a;p-chart to be quite helpful.;35. T F A;c-chart would be appropriate to monitor the number of weld defects on;the;steel plates of a ship?s hull.;MULTIPLE CHOICE;36. Bags of pretzels;are sampled to ensure proper weight. The overall average for the;samples is nine;(9) ounces. Each sample contains 25 bags. The standard deviation;is estimated to;be three (3) ounces. The upper control chart limit (for 99.7% confi-;dence) for the;average would be____ounces.;a. 9.4;b. 18.0;c.;10.2;d. 7.2;e. 10.8;-2-;37. R-charts measure;changes in;a. central tendency.;b. degree of variation.;c. number of defects per production lot.;d. natural variations.;e. none of the above.;38. Bags of chocolate;candy are sampled to ensure proper weight. The overall average;for the samples;is 36 ounces. Each sample contains twelve bags. The average range;is 1.3 ounces.;The upper control chart limit for the average would be;a. 36.3458;b. 35.6542;c. 38.3101;d. 36.6279;e. 37.1258;39. Bags of tea are;sampled to ensure proper weight. The overall average for the samples;is 8 ounces. Each sample contains 10 bags. The;average range is 0.1 ounces. What is;the lower limit;of the average chart?;a. 7.9692;b. 8.0308;c. 7.9076;d. 8.0924;e. 8.1024;40. The average range;of a process for packaging cereal is 1.1 ounces. If the sample size;is ten (10), find the upper control chart;limit for the range chart.;a. 0.245;b. 1.955;c. 1.777;d. 0.223;e. 0.143;-3-;41. Given the problem;statement in question 40, find the lower control chart limit for the;range chart.;a. 0.245;b. 1.955;c. 1.777;d. 0.223;e. 0.143;42. Defects in;computer hard-drives will usually render the entire computer worthless.;For a;particular model, the percent defective in the past has been 1%. If a sample;size of 400 is;taken, what would the 95.5% lower control chart limit be?;a. 0.00995;b. 0.00005;c. 0.00000;d. 0.01000;e. 0.09550;43. Defects in marble;countertops usually require the whole top to be reconstructed.;In one kitchen;shop, the percent defective in the past has been one (1) percent.;If a sample;size of 30 is taken, what should be the 95.5% percent upper control;limit?;a. 0.030;b.;0.000;c. 0.046;d. 0.064;e. 0.074;44. A firm has been;receiving complaints about the attitude of some sales clerks. Over a;10-day period;the total number of complaints was 360.;The firm wishes to develop;a control chart;for the number of complaints. What would the upper control limit on;the number of;complaints per day be for a 3 sigma (99.7%) control chart?;a. 18;b. 36;c. 42;d. 54;e. 62;-4-;45. Given the same;problem statement above, the total number of complaints is now 250.;What would the lower control limit on the number of;complaints per day be for a;3 sigma;99.7%) control chart?;a. 20;b. 0;c. 15;d. 10;e. 202.6;46. Who introduced;control charts in 1924?;a. W. Edwards Deming.;b. Philip Crosby.;c. J.M. Juran.;d. William Shewhart.;e. Malcolm Baldrige.;47. To guarantee that;cans of soda are properly filled, some cans are sampled and the;amounts;measured. The overall average for the samples is 12 ounces. Each sample;contains 10;cans. The average range is 0.4 ounces. The lower control chart limit;for the average;would be;a. 12.1232;b. 11.8768;c. 13.2000;d. 12.3080;e. 11.5500;48. The control;chart;a. focuses on the time dimension of a system.;b. captures the natural variability in the;system.;c.;can be used for categorical, discrete, or continuous variables.;d. all of the above.;-5-;49. Which of the;following situations suggests a process that appears to be operating;in a state of;statistical control?;a. a control chart with a series of consecutive;points that are above the center line;and a;series of consecutive points that are below the center line.;b. a control chart in which no points fall;outside either the upper control limit or;the lower;control limit, and no patterns are present.;c. a control chart in which several points fall;outside the upper control limit.;e. all of the above.;50. A political;pollster randomly selects a sample of 100 voters each day for 8 successive;days and asks;how many will vote for the incumbent.;The pollster;wishes to construct a ?p? chart to see if the percentage favoring the in-;cumbent;candidate is too eratic.;Sample (Day) Number Favoring Incumbent;1 57;2 57;3 53;4 51;5 55;6 60;7 56;8 59;What is the;numerical value of the center line for the ?p? chart?;a. 0.53;b. 0.56;c. 0.63;d. 0.66;51. Given the problem;statement above, what is the numerical value of the lower control;limit for the;?p? chart?;a. 0.37;b. 0.41;c. 0.50;d. 0.71


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