ASQ ASQ Six Sigma Green Belt CSSGB Questions & Answers

• Question 281:

  What is the purpose of an operational definition.

  Correct Answer: An operational definition promotes effective communication between people by putting communicable meaning into an adjective.

• Question 282:

  Create an operational definition for "12 pound bar" that results in attribute data.

  Correct Answer: Check the answer in explanation.

  Criteria: Select a bar from inventory. Place it on a digital scale. If the digital readout is between 11.999 and 12.001, inclusive, then the bar is classified as 12 pounds. If the digital readout is not between 11.999 and 12.001, inclusive, then the

  bar is classified as not 12 pounds.

  Test: Select a particular bar and put it on the scale. Record the digital readout. Decision:

  If 11.999 ≤ digital readout ≤ 12.001, then bar = 12 pounds.

  If digital readout < 11.999 or digital readout >12.001, then bar ≠ 12 pounds.

• Question 283:

  Create an operational definition for "12 pound bar" that results in measurement data.

  Correct Answer: Check the answer in explanation.

  Criteria: Use a digital scale to weigh a bar.

  Test: Select a particular bar and put it on the digital scale. Record the digital readout.

  Decision: Use bar based on digital readout.

• Question 284:

  A customer wants to buy chocolate bars with a nominal weight of 6.0 ounces and will accept a tolerance of 0.05 ounces either side of nominal. As a supplier of chocolate bars you want to understand your process. Your process produces chocolate rectangles that are cut from larger blocks of chocolate and then packaged as six-ounce bars. Every 15 minutes, three chocolate bars are weighed, prior to packaging. The chart below shows the weights for each bar examined in a seven-hour day.

  Correct Answer: Check the answer in explanation.

  

• Question 285:

  Use Minitab to construct a run chart and a histogram from this data set.

  

  Interpret the charts. What conclusions about the distribution of the weights can you reach based on these charts?

  Correct Answer: Answer: The histogram shows that the most of chocolate bars weigh more than 6.00 ounces. The run chart shows that the observed weights plotted over time have upward drift in the weights of chocolate bars throughout the day. The run chart also indicates the need for action on the process.

• Question 286:

  Use Minitab to construct an X and R-chart from this data set. Is the process stable? If no, at what times is it unstable?

  Correct Answer: Check the answer in explanation.

  

  No, when 9:30am, 10:15am, 10:30am, 3:15pm and 4:00pm.

• Question 287:

  What is the overall process mean?

  Correct Answer: 6.024

• Question 288:

  What is the estimate of the process standard deviation?

  Correct Answer: (0.019286/d2) = (0.019286/1.693) = 0.01139.

• Question 289:

  Why did you use this formula versus another formula?

  Correct Answer: Check the answer in explanation.

  ( R ÷ d2) was used instead of the formula for the sample standard deviation because ( R ÷ d2) considers only short term variation, while the formula for the sample standard considers long term variation.

  ( R ÷ d2) assumes that the process is stable. If the process is not stable, the out of control points will jump out of the control limits based on ( R ÷ d2). The ( R ÷ d2) limits are tighter than limits based on the sample standard deviation.

• Question 290:

  State the LSL and USL for the above process.

  Correct Answer: LSL = 5.95 and USL = 6.05