The number of defects after a hotel room cleaning (sheets not straight, smears on a mirror, missed debris on the carpet, etc) should be measured using what type of control chart?

a. x-bar chart

b. R-chart

c. p-chart

d. c-chart

e. either x-bar chart or R chart

The correct answer is d. c-chart.

Explanation:

C-charts are used to control the number of defects in a sample of the product or inspection unit. Then, to control this process, an inspector is placed at the end of the production line and every hour removes an inspection unit (in this case a cell phone), verifies and records the total number of defects.