Please answer the following True or False questions. Show all work. 1) A process
ID: 2747502 • Letter: P
Question
Please answer the following True or False questions. Show all work.
1) A process is capable if special cause variation is not present in the process.
2) Random variation is also referred to as uncontrollable variation.
3) Control charts are used to determine if there are unexpected variation in the process.
4) Three items in parallel, each having a reliability of 0.90have an overall system reliability of 0.999.
5) The lower control limit for an R-chart can be lower than 0.
6) Process stability means that there is no common variation in the process.
7) Effective benchmarking must be against the best company in the same industry.
8) A Six Sigma process must have a process capability index of 2.0 or higher.
9) In a Normally distributed process the mode and the mean have the same value.
10) Quality invariably leads to better financial results.
Explanation / Answer
1) A process is capable if special cause variation is not present in the process.
True, the process capability involves only common cause variation and not special cause variation.
2) Random variation is also referred to as uncontrollable variation.
True, Random variation is that variation in a process that can be measured and analyzed. If it is controlled, then by definition, it is not random.
3) Control charts are used to determine if there are unexpected variation in the process.
True, that is the main purpose of control charts
4) Three items in parallel, each having a reliability of 0.90have an overall system reliability of 0.999.
True , Overall system reliability = 1- (1-.9) * (1- .9) * (1-.9) = 0.999
5) The lower control limit for an R-chart can be lower than 0.
False, even if the value of Lower control chart limit is coming negative by calculation then also it is assumed at zero not below than that.
6) Process stability means that there is no common variation in the process.
False, Process stability means the pattern of variation remains stable, not that there is no variation in the variable measured
7) Effective benchmarking must be against the best company in the same industry.
False, effective benchmarking is a way of discovering what is the best performance being achieved whether in a particular company in same industry or by an entirely different industry
8) A Six Sigma process must have a process capability index of 2.0 or higher.
True, a Six Sigma process must have a process capability index of at least 2.0.
9) In a Normally distributed process the mode and the mean have the same value.
The numerical value of the mode, the mean and median is same in a normal distribution
10) Quality invariably leads to better financial results.
True, Quality invariably leads to better business and reliability for the product therefore better financial results also