Question: A Quality Analyst wants to construct a sample mean chart for controlling a packaging process. The analyst knows from past experience that whenever this process

A Quality Analyst wants to construct a sample mean chart for controlling a packaging process. The analyst knows from past experience that whenever this process is under control, package weight is normally distributed with a mean of twenty ounces and a standard deviation of two ounces. Each day last week, the analyst randomly selected four packages and weighed each with the following results:

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

If upper and lower control limits of 23 and 17 ounces are used, on what day(s), if any, does this process appear to be out of control?

Multiple Choice

The process is in control
Monday
Monday and Tuesday
Monday, Tuesday, and Thursday
Tuesday

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