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Determine whether the underlined numerical value is a parameter or a statistic. Explain your reasoning.

In a poll of a sample of 12,000 adults in a certain city, 12% said they left for work before 6 a.m.
Choose the correct answer below.

A. Parameter, because the data set of a sample of 12,000 adults in a city is a population. 
B. Statistic, because the data set of all adults in a city is a population. 
C. Parameter, because the data set of a sample of 12,000 adults in a city is a sample. 
D. Statistic, because the data set of a sample of 12,000 adults in a city is a population. 
E. Parameter, because the data set of all adults in a city is a population. 
F. Statistic, because the data set of a sample of 12,000 adults in a city is a sample.
G. Parameter, because the data set of all adults in a city is a sample. 
H Statistic, because the data set of all adults in a city is a sample.