Xbar and's Chart
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High Quality Content by WIKIPEDIA articles! In statistical quality control, the bar x and s chart is a type of control chart used to monitor a variables data when samples are collected at regular intervals from a business or industrial process. 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 done with the bar x and R and individuals control charts. As with the bar x and R and individuals control charts, the bar x chart is only valid if the within-sample variability is constant. Thus, the s chart is…mehr

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High Quality Content by WIKIPEDIA articles! In statistical quality control, the bar x and s chart is a type of control chart used to monitor a variables data when samples are collected at regular intervals from a business or industrial process. 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 done with the bar x and R and individuals control charts. As with the bar x and R and individuals control charts, the bar x chart is only valid if the within-sample variability is constant. Thus, the s chart is examined before the bar x chart; if the s chart indicates the sample variability is in statistical control, then the bar x chart is examined to determine if the sample mean is also in statistical control.