Question: A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that whenever this process is

A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that whenever this process is in control, package weight is normally distributed with a mean of 20 ounces and a standard deviation of two ounces. Each day last week, he randomly selected four packages and weighed each:

Day Weight (ounces)
Monday 23 22 23 24
Tuesday 23 21 19 21
Wednesday 20 19 20 21
Thursday 18 19 20 19
Friday 18 20 22 20

23 What is the sample mean package weight for Thursday?

Multiple Choice

  • 19 ounces

  • 20 ounces

  • 20.6 ounces

  • 21 ounces

  • 23 ounces

24 What is the mean of the sampling distribution of sample means when this process is in control?

Multiple Choice

  • 18 ounces

  • 19 ounces

  • 20 ounces

  • 21 ounces

  • 22 ounces

25 If he uses upper and lower control limits of 22 and 18 ounces, on what day(s), if any, does this process appear to be out of control?

Multiple Choice

  • Monday

  • Tuesday

  • Monday and Tuesday

  • Monday, Tuesday, and Thursday

  • None

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