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Jessica Swanson works for a bakery company which uses a small amount of chocolate flavoring to...

Jessica Swanson works for a bakery company which uses a small amount of chocolate flavoring to produce some of their cakes. Some customers have been complaining about inconsistent taste and quality of the cakes produced by the company. To investigate this, the managers of the cake company have ordered Martin to investigate the process which adds chocolate to the cake dough. The table below lists measurements Jessica took. Please show steps for solving with Excel for A & B:

Sample

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2

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5

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10

9

9

12

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9

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12

9

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9

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9

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8

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  1. Construct a control chart for the process mean. Is the process mean in control? Why or why not?
  2. Construct a control chart for the process variance. Is the process variance in control? Why or why not?

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Answer #1

entering the data in the spreadsheet as shown below

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