Question

The process capability indexes (Cpk) of four processes are as follows:

For process Q, Cpk = 0.81
For process R, Cpk = 2.26
For process S, Cpk = 0.63
For process T, Cpk = 1.52
Which two processes are capable?
O process Q and process S
O process Q and process T
O process R and process S
O process R and process T
O process Q and process R

Answer 1

Process Capability Index (Cpk) is used to determine if a process is capable. Processes R (Cpk = 2.26) and T (Cpk = 1.52) are both above the benchmark of 1.33, indicating they are capable. Processes Q and S are not capable as their Cpk values are below the benchmark.

Step-by-step explanation:

The Process Capability Index (Cpk) is a statistical measure of a process's ability to produce output within specified limits. A Cpk of 1.33 or higher is often considered a benchmark for a capable process, indicating that the process output is well within the tolerance limits, meeting quality requirements. Examining the given Cpk values:

• Process Q: Cpk = 0.81, which is lower than the benchmark, so it is not considered capable.
• Process R: Cpk = 2.26, which is well above the benchmark, indicating a very capable process.
• Process S: Cpk = 0.63, also below the benchmark and hence not capable.
• Process T: Cpk = 1.52, which is above the benchmark, suggesting that the process is capable.

Therefore, Process R and Process T are the two processes that are capable.