A random sample of 121 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 0.22 ounces. In this problem the 0.22 is

a. a parameter
b. a statistic
c. the standard error of the mean
d. the average content of colognes in the long run

A

Business

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