## What are the 4 types of control charts?

Types of Control Charts (SPC).

- X bar control chart.
- Range “R” control chart.
- Standard Deviation “S” control chart.
- Attribute Control Charts:
- “u” and “c” control charts.
- “p” and “np” control charts.
- Pre-control Charts.

## What are the types control chart?

ProDiver control charts fall into one of two categories: variable or attribute. Variable control charts plot measurable process data in a time-ordered sequence. Attribute control charts plot data that is counted instead of being measured.

**What are the different types of control chart for attributes?**

An attribute chart is a type of control chart for measuring attribute data (vs. continuous data). There are four types of attribute charts: c chart, n chart, np chart, and u chart. The choice of charts depends on whether you have a problem with defects or defectives, and whether you have a fixed or varying sample size.

**What are the two types of control charts for variables?**

There are two types of variables control charts: charts for data collected in subgroups, and charts for individual measurements.

### What is UCL and LCL?

The Upper Control Limit (UCL) and the Lower Control Limit (LCL) form a corridor within which a quality characteristic meets the desired value or a normal deviation. Outside the limitations of UCL and LCL, the quality measured is considered as abnormal and requires intervention in the relevant process.

### How many types of variation are there in a control chart?

two types

Control charts are used to monitor two types of process variation, common-cause variation and special-cause variation.

**How many control charts are there?**

Depending on the number of process characteristics to be monitored, there are two basic types of control charts. The first, referred to as a univariate control chart, is a graphical display (chart) of one quality characteristic.

**What is Variable and attribute control chart?**

What is a variables control chart? Variables control charts plot continuous measurement process data, such as length or pressure, in a time-ordered sequence. In contrast, attribute control charts plot count data, such as the number of defects or defective units.

#### What is a Variable control chart?

Variables control charts are used to evaluate variation in a process where the measurement is a variable–i.e. the variable can be measured on a continuous scale (e.g. height, weight, length, concentration).

#### What is USL and LSL?

USL = Upper Specification Limit. LSL = Lower Specification Limit. The “customer” defines your specification limits.

**What is USL and LSL in control chart?**

These are USL (Upper Specification Limit) and LSL (Lower Specification Limit). Such limits externally imposed (e.g. imposed by the customer). Units falling outside these limits are unac- ceptable and will be rejected.

**What are the 3 measures of variation?**

Measures of Variability

- Range.
- Interquartile range (IQR)
- Variance and Standard Deviation.