attribute control chart

The operators of automated sorting machines in a post office must read the ZIP code on a letter and divert the letter to the proper carrier route. Over one month’s time, 25 samples of 100 letters were chosen, and the number of errors was recorded. Which control chart can be used to monitor the sorting process?

• attribute control chart

• c chart

• p chart

• np chart

A catalog distributor ships a variety of orders each day. The packing slips often contain errors such as wrong purchase order numbers, wrong quantities or incorrect sizes. Which control chart can be used to monitor the shipping process?

• c chart

• u chart

• p chart

• np chart

An electronics manufacturer produces circuit boards. The boards may contain various defects, such as faulty components and missing connection. Assuming that all the circuit boards are the same, which control chart should be used?

• classification chart

• count chart

• c chart

• u chart

• np chart

An electronics manufacturer produces circuit boards. The boards may contain various defects, such as faulty components and missing connection. If the process produces boards of varying sizes with different numbers of components and connections, which control chart should be used?

• classification chart

• count chart

• c chart

• u chart

• p chart

 A telemarketing firm that wants to track the number of calls needed to make one sale. Which control chart can be used?

• p chart

• np chart

• c chart

• u chart

which probability distribution is related to classification chart?

• Normal

• Poisson

• Binomial

• Chi-square

which probability distribution is related to count chart?

• Normal

• Poisson

• Binomial

• Chi-square

The average nonconforming fraction of a process is 0.5%. What is the minimum sample size that we need to collect for attribute control chart?

How many samples (subgroups) we need to collect for the control chart?