A Proctor and Gamble factory process fills boxes with detergent. Construct an appropriate set of control charts to monitor the process. Historical data for fill weight (in ounces) of eight samples is presented below. A sample size of six was used.

Identify the chart that is also known as fraction nonconforming or fraction defective chart.

a.	A c-chart
b.	A p-chart

Sample 1 234 5 6 7 8 Sample Mean 15.80 16.10 16.02 15.95 16.12 16.18 15.87 16.20 Sample Range 0.42 0.38 0.08 0.15 0.42 0.23 0.36 0.40