Chapter 22: U-Charts

The number of inspection units in a subgroup, n, is 4. The inspection unit is 400. The number of items sampled is _____ .

1,600

The IU is 2,000. The sample size is 3,000. what is the value of n.

1.5

A U-Chart measures the average number of nonconformities per inspection unit sampled.

TRUE

An inspection unit is the basic unit inspected for nonconformities.

TRUE

If the LCL is negative, it is positioned at zero.

TRUE

If the subgroup size is 4, this means that a particular sample has included 4 inspection units

TRUE

Which of the following control charts is most appropriate for monitoring the number of defects on different sample sizes?

U

The value of u is equal to the number of nonconformities divided by the ___________ .

subgroup size

An inspection unit is 100. The sample size is 400. The subgroup size is ____ .

4

An inspection unit must be large enough to ensure that nonconforming results are unlikely to occur.

FALSE

In an U-Chart the mean of the process changes when the sample size changes.

FALSE

The UCL and LCL change because the value of u bar changes with every sample.

FALSE

The inspection unit and the number in a sample are the same.

FALSE

The number of inspection units changes with every sample.

FALSE

The sample size must be the same as the IU.

FALSE

The upper control limit in a U-Chart remains the same for all samples.

FALSE

The value of an inspection unit changes for every sample taken.

FALSE

U-Charts focus on continuous data.

FALSE