Which of the following yields a simple random sample?
A)All students in a class are divided into groups of 40. One student is randomly chosen from the first group, the remaining observations are every 40th student thereafter.
B)The best 40 students, according to the opinion of the instructor, in a class are selected.
C)The names of 100 students in a class are written on 100 different pieces of paper and put in a hat. The first 40 pieces of paper are selected blindly one at a time without replacing them back in the hat after shuffling the papers thoroughly.
D)All students in a class are divided into groups according to the rows in which they are seated. One of the groups is randomly selected.
C) The names of 100 students in a class are written on 100 different pieces of paper and put in a hat. The first 40 pieces of paper are selected blindly one at a time without replacing them back in the hat after shuffling the papers thoroughly.
This method of selection ensures that every student in the class has an equal chance of being selected for the sample.