How to do stratified random sampling - AP Statistics
Card 0 of 2
A study testing the effect of caffeine on mental performance invited 
participants for an experiment. The participants were selected randomly. 
people were selected from men who did not drink coffee. 
were selected from women who did not drink cofee. 
were selected from men who regularly drank coffee, and 
from women who regularly drank coffee. What type of sampling method is this?
A study testing the effect of caffeine on mental performance invited
Stratified Sampling is the method of randomly selecting subjects from various stratum, or subsets of the population. In this case, there were 4 stratum from which participants were randomly selected.
Stratified Sampling is the method of randomly selecting subjects from various stratum, or subsets of the population. In this case, there were 4 stratum from which participants were randomly selected.
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Which of the following is an example of stratified random sampling when obtaining a sample of 
high school students?
Which of the following is an example of stratified random sampling when obtaining a sample of
In order for there to be a stratified random sample, the target population must be split into different groups (i.e. grade levels). The sample population must be selected at random from each of these groups (i.e. choosing 
students from each of four different grade levels or groups). The other examples, although random, are not specifically stratified in their sampling methodology.
In order for there to be a stratified random sample, the target population must be split into different groups (i.e. grade levels). The sample population must be selected at random from each of these groups (i.e. choosing
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