Exam 7: Quality Assurance

Process managers working with the SPC charts and 25 initial samples usually can remove assignable causes and stabilize the process.

A subassembly of electronic components consists of 4 parts that can fail.Three parts have failure probabilities of 0.04.The other part has a failure probability of 0.01.Each component can only be tested after assembly into the coffee maker.It takes a week to get the components (lead time) and the appliance manufacturer has orders for the next five days of 45,55,62,35,and 25.How many electronic components should be on had now so that all orders can be filled?

Why must management have a thorough understanding of the production process?

Data check sheets are used for recording and keeping track of data regarding the frequency of events that are considered to be essential for some critical aspect of quality.

In a p-chart the lower-control limit is always better as it gets closer to _____ defect(s).

_____ are identifiable causes of process problems that create variability.They are traceable and can be removed.

What are the most important goals for process analysis?

The term,Zero Defects,was popularized by:

_____ percent inspection makes sense for products where failure is life threatening.

Pareto charts attempt to separate the critical _____ from the unimportant _____.

The c-chart shows the number of defectives in successive samples.

The x-bar and R-charts are best used together because sometimes an assignable cause creates no shift in the process average,or in the average value of the standard deviation,but a change occurs in the distribution of R values.

_____ seek to identify the most frequently occurring categories.

To determine the cause of a _____ problem,start by listing everything in the process that might be responsible for the problem.

LTPD measures the average percentage of defective items the supplier will ship to the buyer under different conditions of actual percent defectives in the lot.

Monitoring by variables _____ monitoring by attributes.

The Alpha error is the probability of incorrectly accepting bad lots.This is equivalent to making the mistake of launching a new product that fails because the test incorrectly accepted it as a winner.

_____ are frequency distributions.

For AS,the _____ approximation of the OC curve is needed when the lot size,N,is small.

After setup in the job shop,the first items made are likely to be defectives.If the order size calls for 225 units,and the expected percent defective for start-up is 9 percent,how many units should be made?