QUESTION 4
Which of the following yields a systematic sample?
A)All students in a class are divided into groups of 20. One student is randomly chosen from the first group, the remaining observations are every 20th student thereafter.
B)The best 20 students, according to the opinion of the instructor, in a class are selected.
C)All students in a class are grouped according to their gender. A random sample of 10 is selected from the males and a separate random sample of 10 is drawn from the females.
D)A random sample of 20 students is selected from a class without replacement