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Statistics Multiple Choice Questions




Question;Question: Statistical process control relies on _____. A Capability modelsB Variance analysesC Control chartsD Conformance reports;Question: Twenty samples of size 6 were collected for a variable measurement. Determine the upper control limit (UCL) and lower control limit (LCL) for an R-chart if the sum of the sample ranges equals 88.0. A UCL = 8.8176, LCL = 0.0000B UCL = 9.3016, LCL = 0.3344C UCL = 13.2000, LCL = 0.0000D UCL = 29.3921, LCL = 0.0000;Question: x-charts are used for A Averages of variables dataB Individual attribute dataC Individual variables dataD Averages of attributes data;Question: In determining whether a process is in statistical control, the _____ is/are generally analyzed first. A R-chartB Control limitsC Average rangeD Nonconformance;Question: In pre-control, which zone covers the nominal dimension? A Gray zoneB Yellow zoneC Red zoneD Green zone;Question: Which of the following is not an indication of an out-of-control process? A Five consecutive points fall on one side of the center lineB Four of five consecutive points fall within the outer two-thirds region between the center line and one of the control limitsC Two of three consecutive points fall in the outer one-third region between the center line and one of the control limitsD A single point falls above the upper control limit;Question: A machined part has a lower tolerance limit of 3.5 inches and an upper tolerance limit of 3.9 inches. The range for the pre-control green zone is A 3.5 to 3.9 inchesB 3.7 inches to 3.9 inchesC Less than 3.5 inchesD 3.6 inches to 3.8 inches;Question: If the process mean and variance do not change over time, the process is considered to be A In controlB SymmetricC StableD Capable;Question: Each day, a manufacturing company producing circuit boards will randomly sample 60 circuit boards and then determine and plot the number of defects contained in each of these boards. The appropriate control chart is a A -chartB p-chartC np-chartD c-chart;Question: Control limits relate to _____, while specification limits relate to individual measurements. A Values within the upper and lower control limitsB Total values in the rangeC Median valuesD Averages of samples;Question: A precision parts manufacturer produces bolts for use in military aircraft. The specifications for bolt length are 37.50 ? 0.25 cm. The company has established an -chart and an R-chart using samples of size five. The centerlines for the -chart and R-chart are set at 37.65 cm and 1.03 cm, respectively. What is the value of Cp for this process? A 0.188B 1.333C 0.301D 0.166;Question: The control chart most appropriate for plotting the daily percentage of students that wait longer than five minutes in line at the undergraduate admissions office is a(n) A p-chartB np-chartC x-chartD -chart;Question: The _____ is used to monitor the centering of the process. A -chartB R-chartC p-chartD np-chart;Question: If the traditional 3-sigma limits on a control chart are replaced by 2-sigma limits, which of the following is TRUE? A Type I errors decreaseB Type I errors increaseC Type II errors increaseD The center line moves downward;Question: Five samples of size 3 were collected for a variable measurement. All sample data were greater than or equal to 4.0. The sample means and sample ranges are provided in the following table.Sample number 1 2 3 4 5 ________________________________________Sample mean 5.0 4.9 5.0 6.0 5.2 Sample range 0.2 0.4 0.1 0.0 0.3;The values of which sample are identical? A Sample 1B Sample 2C Sample 3D Sample 4;Question: Which of the following charts is used to monitor the total number of defects per unit when a constant subgroup size is employed? A s-chartB c-chartC p-chartD u-chart;Question: An -chart is used to monitor the process A RangeB MedianC VarianceD Mean;Question: Which of the following is a likely cause of the control chart pattern known as a trend? A Aging equipmentB Change in setup methodC New operatorD A mixture of two materials;Question: Determine the sample standard deviation for the following sample data: 7, 9, 2, 0, 1, and 5. A 3.347B 3.266C 2.993D 3.578;Question: A p-chart is also called a A Pre-control chartB Probability chartC Fraction defective chartD Process capability chart;Question: Which of the following pairs of charts are used together? A -chart and p-chartB R-chart and p-chartC R-chart and s-chartD -chart and R-chart;Question: c-charts are based on the _____ probability distribution A NormalB BinomialC PoissonD Uniform;Question: In an -chart, the upper control limit is equal to the overall sample mean plus three times the A Process standard deviationB Average rangeC Standard error of the meanD Sample variance;Question: A _____ monitors the fraction of nonconforming items. A p-chartB x-chartC s-chartD c-chart;Question: Which of the following would be used to monitor the number of nonconforming items? A np-chartB p-chartC u-chartD n-chart;Question: If the sample size in a p-chart increases from 100 to 120, the upper and lower control limits will A Move farther apartB Move closer togetherC Remain the same distance apartD Both shift upward;Question: Control limits are often confused with _____. A Control chartsB Tolerance limitsC Specification limitsD Variance limits;Question: Collecting _____ data is usually easier than collecting _____ data because the assessment can usually be done more quickly by a simple inspection or count. A Attribute, variableB Concrete, continuousC Random, discreteD Simple, continuous;Question: In the application of control charts, as the sample size is increased A Type I errors are reduced, and Type II errors are increasedB Type I errors are increased, and Type II errors are reducedC Both Type I and Type II errors are increasedD Both Type I and Type II errors are reduced;Question: A process is deemed ?out of control? when A Common causes are presentB Special causes are presentC Data varies around the meanD Random variation is present


Paper#57749 | Written in 18-Jul-2015

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