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X-bar chart. In industrial statistics, the X-bar chart is a type of Shewhart control chart that is used to monitor the arithmetic means of successive samples of constant size, n. This type of control chart is used for characteristics that can be measured on a continuous scale, such as weight, temperature, thickness etc. For example, one might ...
The sample size is relatively small (say, n ≤ 10— ¯ and s charts are typically used for larger sample sizes) The sample size is constant; Humans must perform the calculations for the chart; As with the ¯ and s and individuals control charts, the ¯ chart is only valid if the within-sample variability is constant. [4]
The sample size is relatively large (say, n > 10— ¯ and R charts are typically used for smaller sample sizes) The sample size is variable; Computers can be used to ease the burden of calculation; The "chart" actually consists of a pair of charts: One to monitor the process standard deviation and another to monitor the process mean, as is ...
p-chart. In statistical quality control, the p-chart is a type of control chart used to monitor the proportion of nonconforming units in a sample, where the sample proportion nonconforming is defined as the ratio of the number of nonconforming units to the sample size, n. [1]
File:Xbar chart for a paired xbar and R chart.svg. Size of this PNG preview of this SVG file: 600 × 599 pixels. Other resolutions: 240 × 240 pixels | 481 × 480 pixels | 769 × 768 pixels | 1,026 × 1,024 pixels | 2,051 × 2,048 pixels | 630 × 629 pixels. This is a file from the Wikimedia Commons. Information from its description page there ...
File:Xbar chart for a paired xbar and s chart.svg. Size of this PNG preview of this SVG file: 600 × 599 pixels. Other resolutions: 240 × 240 pixels | 481 × 480 pixels | 769 × 768 pixels | 1,026 × 1,024 pixels | 2,051 × 2,048 pixels | 630 × 629 pixels. This is a file from the Wikimedia Commons. Information from its description page there ...
Control charts are graphical plots used in production control to determine whether quality and manufacturing processes are being controlled under stable conditions. (ISO 7870-1) [1] The hourly status is arranged on the graph, and the occurrence of abnormalities is judged based on the presence of data that differs from the conventional trend or deviates from the control limit line.
A bar chart or bar graph is a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent. The bars can be plotted vertically or horizontally. A vertical bar chart is sometimes called a column chart. A bar graph shows comparisons among discrete categories.