Which of the following yields a systematic sample?

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.

Q. 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.

Q. 3

To gather information on the preferences of instructors at universities on topics for a business statistics textbook that it will publish, a publishing company invited 10 faculty members who have adopted one of the textbooks that it has published. This is an example of a
 
  A) simple random sample. B) systematic sample.
  C) judgment sample. D) stratified sample.

Q. 4

A company selling apparel online sends out emails every Monday to all its customers who made a purchase. This is an example of a
 
  A) convenience sample. B) simple random sample.
  C) stratified sample. D) systematic sample.

Q. 5

To demonstrate a sampling method, the instructor in a class picked the first 5 students sitting in the last row of the class. This is an example of a
 
  A) convenience sample. B) systematic sample.
  C) simple random sample. D) stratified sample.