The principal of a small elementary school wants to select a simple random sample of 24 students. The school has 12 classrooms with 18 students in each class. She decides to randomly select two students from each classroom.
Is this a simple random sample?
A) Yes, because a stratified sample is a type of simple random sample.
B) No, because not all combinations of 24 students could have been chosen.
C) Yes, because each student had an equal chance to be selected.
D) No, because each student did not have an equal chance of being selected.
E) Yes, because the students were selected at random.
Question 2
Which of these is not an advantage of using a stratified sample instead of a simple random sample?
A) the stratified sample eliminates the need for randomization
B) the stratified random sample allows you to get information about each stratum
C) the stratified sample allows you to get more reliable estimates using the same sample size
D) the stratified sample reduces sample to sample variability
E) the stratified sample reduces bias
Comparison of small subunit rRNA gene sequences of vertebrate, invertebrate chordate, and invertebra
A small sample of the great diversity of seed sizes and shapes.
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The small intestine.
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