If a process is considered to be out of control, when in fact it is performing c

Question

If a process is considered to be out of control, when in fact it is performing correctly, a Type II error occurs.

True

False

If a process is considered to be out of control, then repairs or adjustments may be needed.

True

False

The two types of control charts used for means fall into two categories, X-bar charts and R charts, depending on which type of performance measure is collected.

True

False

The first step in constructing a control chart is to collect representative historical data from which an estimated population mean and variance for the system performance can be measured.

True

False

Explanation / Answer

1) If a process is considered to be out of control, when in fact it is performing correctly, a Type II error occurs - FALSE

Explanation: This is a false positive test, where the process is considered to be not performing well falsely when it is performing well and correctly. Then, in such case, Type I error will occur.

2) If a process is considered to be out of control, then repairs or adjustments may be needed - TRUE

If a process is out of control, then certain adjustments are made such that process can be within the control.

3)The two types of control charts used for means fall into two categories, X-bar charts and R charts, depending on which type of performance measure is collected - TRUE

4)The first step in constructing a control chart is to collect representative historical data from which an estimated population mean and variance for the system performance can be measured - TRUE

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