Stratified random sampling procedures are used when we wish to ...

[stephzh]

Stratified random sampling procedures are used when we wish to
 
  A) represent accurately subgroups of a population in the sample.
  B) study geological events.
  C) employ a larger sample.
  D) take a random sample from the entire population.

Question 2

What is a major problem with simple random sampling?
 
  A) The researcher needs a list of all the members of a population, which is difficult to obtain for a large population.
  B) The researcher needs to contact all the people in the population, which would be difficult for a large population.
  C) The sample usually over-represents certain segments of the population.
  D) There is a systematic bias that leads to persons with certain characteristics having a higher probability of being selected.

[dantucker]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: A

[stephzh]

Excellent

[adf223]

Gracias!