Which of the following yields a simple random sample?
A) The names of 50 students in a class are written on 50 different pieces of paper and put in a hat. The first 15 pieces of paper are selected blindly one at a time after shuffling the papers thoroughly and each of the selected pieces is placed back into the hat before the next piece is selected.
B) The best 15 students, according to the opinion of the instructor, in a class are selected.
C) All students in a class are divided into groups according to the rows that they are seated. One of the groups is randomly selected.
D) 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.
Question 2
Which of the following yields a simple random sample?
A) All students in a class are divided into groups according to the rows that they are seated. One of the groups is randomly selected.
B) The best 15 students, according to the opinion of the instructor, in a class are selected.
C) The names of 50 students in a class are written on 50 different pieces of paper and put in a hat. The first 15 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 of 15. One student is randomly chosen from the 1st group, the remaining observations are every 15th student thereafter.
A sample flow sheet.
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Structures of class I, class II, and class III mobile genetic elements
) Random assortment of maternal (blue) and paternal (purple) chromosomes at metaphase
Random distribution of dandelions