A Quality Analyst Wants to Construct a Sample Mean Chart

Multiple Choice

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: What is the standard deviation of the sampling distribution of sample means?

A) 0.1 ounces
B) 0.4 ounces
C) 0.5 ounces
D) 1 ounces
E) 2 ounces