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: A Quality Analyst wants to construct a sample What is the standard deviation of the sampling distribution of sample means for whenever this process is under control?

Select one:

2 ounces

0.4 ounces

0.5 ounces

0.1 ounces

1 ounce

please explain

Day Monday Tuesday Wednesday Thursday Friday WEIGHT (Ounces) 23 22 23 23 21 19 20 19 20 18 19 20 18 20 22 24 21 21 19 20

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