Which of the following yields a systematic sample?
A) A random sample of 15 students is selected from a class without replacement.
B) All students in a class are grouped according to their gender. A random sample of 8 is selected from the males and a separate random sample of 7 is drawn from the females.
C) The best 15 students, according to the opinion of the instructor, in a class are selected.
D) All students in a class are divided into groups of 15. One student is randomly chosen from the 1st group, the remaining observations are every 15th student thereafter.
Question 2
To find out the potential impact of a new zoning law on a neighborhood, the legislators conduct a focus group interview by inviting the members of the housing owners association of that neighborhood. This is an example of a
A) simple random sample. B) cluster sample.
C) systematic sample. D) judgment sample.
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