soring operations Activity: p$-$Chart for Quality Control

Conceptual Overview: Exploring how p$-$charts are used to detect processes out of control. sense of a p$-$chart in control.

Created by Gary H$.$ McClelland, Professor Emerleus $|$ University of Colorado Boulder

Congago Leaming. All Rights Rosorvod.

In a p$-$chart, which of the following is least indicative of a process that is in control?

a$.$ There are about as many points below the center line as there are points above it$.$

b$.$ Most points are near the center line.

c$.$ The points tend to trend higher from left to right.

d$.$ The points appear to be randomly above and below the center line.

In a p$-$chart, which of the following is most accurate?

a$.$ The centerline is always equidistant between the lower limit line and the upper limit line.

b$.$ The lower limit line is never less than zero.