Exam 6: Statistical Quality Control

The person that comes from the top ranks of the organization and is responsible for providing direction and overseeing all aspects of a six-sigma implementation process is called a general.

Eight samples of n = 50 were taken by an operator at a workstation in a production process. The number of defective items in each sample was recorded as follows. Number of Sample Defects 1 10 2 0 3 12 4 8 5 10 6 16 7 14 8 10 (a)Management wants to develop a p-chart. What are the control limits? (b)Is the process in a state of control?

What are the two types of control charts for variables?

The standard deviation measures the difference between the largest and smallest observations in a set of data.

Cholesterol Palace is a fast-food restaurant. Management was concerned with errors in filling orders at its drive-up window. It hired several undercover quality inspectors to randomly place 100 orders while the process seemed to be in control. The completed orders were then checked for accuracy. The following table shows the results of the survey: Defect Frequency Incomplete, shorted order 12 Unordered items dispensed 2 Wrong product dispensed 14 Wrong toppings 14 Wrong size drink 2 Drink lid not sealed 17 No drinking straw with soft drink order 0 No napkins 18 Far too many condiment packets 65 No salt with sandwich or fries order 10 Wrong change 3 Other 12 (a)Use these data to estimate the average number of defects per order and determine the three-sigma control limits for a c-chart. (b)A quality inspector just used the drive-up window and now checks her order. Her cheeseburger has mustard on it although she ordered it without ketchup or mustard. Three handfuls of ketchup and mustard packets are in the sack, but no napkins. And hot coffee has spilled because the lid wasn't properly sealed. Is the drive-up process in control?

Variation in the production process leads to:

The different characteristics that can be measured by control charts can be divided into what two groups?

If the average range is 4.0 inches and the sample size is 18, compute the upper and lower limits for an R chart.

Consumers willingly accept defects if ________________________.

Causes of variation that can be identified and eliminated are called what?

Twenty samples of n = 200 were taken by an operator at a workstation in a production process. The number of defective items in each sample was recorded as follows. Number Number Sample of Defects Sample of Defects 1 12 11 16 2 18 12 15 3 10 13 13 4 15 14 16 5 16 15 18 6 19 16 17 7 17 17 18 8 12 18 20 9 11 19 21 10 14 20 22 Management wants to develop a p-chart using 3-sigma limits. What are the control limits?

What is a graph that shows the probability or chance of accepting a lot given various proportions of defects in the lot?

Suppose that you want to monitor the variability in ounces of a process that fills beer cans. Which control chart would be appropriate?

What measures symmetry of a distribution?

The range of a data set is always non-negative.

A graph that shows the probability or chance of accepting a lot given various proportions of defects in the lot is called an ____________________.