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Determine whether the data set is a population or a sample. Explain your reasoning.
The salary of 9 teachers in a school.
Choose the correct answer below.
A. This is a sample, because it is a collection of salaries for some teachers in the school.
B. This is a population, because it is a collection of salaries for some teachers in the school.
C. This is a sample, because it is a collection of salaries for all teachers in the school.
D. This is a population, because it is a collection of salaries for all teachers in the school.