Quality Style manufactures self-assembling furniture. To reduce the cost of returned orders, the manager of its quality control department inspects the final packages each day using randomly selected samples. The defects include wrong parts, missing connection parts, parts with apparent painting problems, and parts with rough surfaces. The average defect rate is three per day. What type of chart should be used?
1. x-bar chart
2. c-chart
3. p-chart
4. R-chart
Construct a control chart with 3-sigma control limits: (a) CL, (b) UCL, (c) LCL.
Note. If the lower control limit is negative, round the LCL to zero.
(a) (Round your answer to 2 decimal places, the tolerance is +/-0.01)
(b)(Round your answer to 2 decimal places, the tolerance is +/-0.05)
(c) (Round your answer to 2 decimal places, the tolerance is +/-0.05)