A random sample of 144 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.3 ounces. In this problem the 0.3 is
A. a parameter.
B. a statistic.
C. the standard error of the mean.
D. the average content of colognes in the long run.
Answer: A
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