$3\mathrm{.}1.$ Explain the difference between attribute control charts and variable control charts.

atribute control charts $($such as p$-$charts and c$-$charts$),$ the measures of quality are discrete values reflecting a simple decision criterion such as good or bad. Variable$-$control charts $($such as x$-$bar$-$charts and R$-$charts$)$ are continuous variables reflecting measurements such as weight, time, or volume.

Attribute control charts $($such as R$-$charts$),$ the measures of quality are discrete values reflecting a simple decision criterion such as good or bad. Variable$-$control charts $($such as and p$-$charts$)$ are continuous variables reflecting measurements such as weight, time, or volume.

Attribute control charts $($such as p$-$charts$),$ the measures of quality are simple decision criterion such as good or bad. Variable$-$control charts $($such c$-$charts$)$ are time$-$series variables.

Attribute control charts $($such as p$-$charts$),$ the measures of quality are simple decision criterion such as good or bad. Variable$-$control charts $($such as x$-$bar$-$charts and R$-$charts$)$ are time$-$series variables.