The number of defects after a hotel room cleaning (sheets not straight, smears on mirror, missed debris on carpet, etc.) should be measured using a(n)

A) x-bar chart.
B) R-chart.
C) p-chart.
D) c-chart.
E) either x-bar or R chart.

The c-chart is used for counting defects when the number of opportunities for defects is constant. In this case, the number of defects in a hotel room cleaning process (like sheets not straight, smears on mirror, missed debris on carpet) can be counted, making the c-chart the appropriate choice.