Which of the following are two important tools in helping to achieve process quality?

A) standard normal distribution and histogram
B) common causes of variation and special causes of variation
C) statistical process control and process capability analysis
D) confidence interval for the mean and discrete probability distribution

Statistical process control and process capability analysis are two important tools in achieving process quality. Statistical process control helps to monitor and control a process by using statistical methods to detect and respond to variations in the process. Process capability analysis is used to evaluate the ability of a process to consistently produce products or services within specific limits or requirements. Together, these tools help to ensure that a process is stable, predictable, and capable of meeting customer requirements.