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 under control, package weight is normally distributed with a mean of twenty ounces and a standard deviation of two ounces. Each day last week, he randomly selected four packages and weighed each with the following results:

DayWeight (ounces)Monday23222324Tuesday23211921Wednesday20192021Thursday18192019Friday18202220

What value should be used as the mean of the sampling distribution of sample means?

Select one:

19 ounces

20.6 ounces

20 ounces

21 ounces

23 ounces

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