Why can not we use just one of those control charts

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Reference no: EM132168483

using excel

Exercise 2.

Control Charts - When using control charts to monitor a process, why is it necessary to include an x ¯ chart and an R chart?

Why can't we use just one of those control charts?

Exercise 3.

Notation and Terminology - Consider process data consisting of the amounts of Coke (in oz) in randomly selected cans of regular Coke. The process is to be monitored with x ¯ and R charts based on samples of 50 cans randomly selected each day for 20 consecutive days of production. What are x ¯ and R charts, and what do x-bar-bar, R-bar, UCL, and LCL denote?

Monitoring Tablet Hardness. In Exercises 4-6, use the following information: A pharmaceutical manufacturer forms tablets by compressing a granular material that contains the active ingredients and various fillers. The hardness of the sample tablets a measured in kilograms for a pharmaceuticla product. The results are listed in the accompanying table.

Exercise 4.

Tablet Hardness: Notation - Find the mean and range of each sample. After finding the value for the mean and range of each sample, find the values of x ? and R ¯. Also find the values of LCL and UCL for an R chart, and find the values of LCL and UCL for an x ¯ chart.

Reference no: EM132168483

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