3. In the Netherlands, all men take a military pre-induction exam at age 18. The exam
includes an intelligence test known as “Raven’s progressive matrices” and includes
questions about demographic variables like family size. A study was done in 1968,
relating the test scores of 18-year old men to the number of their brothers and sisters.
The records of all the exams taken in 1968 were used.
a. What is the population?
b. What is the sample?
c. Is there any sampling error? Justify your answer.
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