Consider the following condition and comment on whether the sample results may cause concern regarding the quality of the process.
a. A p chart has LCL = 0 and UCL = .068. When the process is in control, the proportion defective is .033. Plot the following seven sample results: .035, .062, .055, .049, .058, .066, and .055. Discuss.
b. An x bar chart has LCL = 22.2 and UCL = 24.5. The mean is µ = 23.35 when the process is in control. Plot the following seven sample results: 22.4, 22.6, 22.65, 23.2, 23.4, 23.85, and 24.1. Discuss.