This is a case on statistical process control and six-sigma. "Sigma" means standard deviation. This is not that bad, but you need to understand properly and you have only one right answer for each of the questions. Make sure you understand, Mean and standard deviation Normal distribution Difference between population standard deviation and the standard deviation of sample means. Some brushing up of statistics (MGT 601 or 500 could be needed). Just focus on normal distribution. Read chapter 10 of your text book thoroughly. You should understand the meaning of UCL (Upper Control Limit) and LCL (Lower Control Limit). UCL and LCL are the limits you put on your control chart. Besides you need to know what USL (Upper Specification Limit) and LSL (Lower Specification Limit) mean. Understand thoroughly the process of getting UCL and LCL. Although you do not have to get those limits yourself- they are given, understanding of the process is crucial in your ability to answering the questions. In order to understand the meaning of six-sigma, you need to understand the difference of these two terms. Make sure you read and understand each page of the slides I posted. This is a case on statistical process control and six-sigma. "Sigma" means standard deviation. This is not that bad, but you need to understand properly and you have only one right answer for each of the questions. Make sure you understand, Mean and standard deviation Normal distribution Difference between population standard deviation and the standard deviation of sample means. Some brushing up of statistics (MGT 601 or 500 could be needed). Just focus on normal distribution. Read chapter 10 of your text book thoroughly. You should understand the meaning of UCL (Upper Control Limit) and LCL (Lower Control Limit). UCL and LCL are the limits you put on your control chart. Besides you need to know what USL (Upper Specification Limit) and LSL (Lower Specification Limit) mean. Understand thoroughly the process of getting UCL and LCL. Although you do not have to get those limits yourself- they are given, understanding of the process is crucial in your ability to answering the questions. In order to understand the meaning of six-sigma, you need to understand the difference of these two terms. Make sure you read and understand each page of the slides I posted