When is a stratified sample an appropriate sampling technique? ...

[humphriesbr@me.com]

When is a stratified sample an appropriate sampling technique?
 
  a) specific characteristics of the population are of no concern
  b) individuals in a population are not equal
  c) each member must have an equal chance of being selected
  d) you have a small population

Question 2

How long should one continue a given phase (baseline, treatment, return to baseline, etc). of
  a single-case research project?
 
  a. until behavioral stability is reached in each phase
  b. for about two weeks
  c. until it is clear that the treatment has had an effect
  d. until you have at least a dozen observations in each phase

[mtmmmmmk]

Answer to Question 1

b

Answer to Question 2

A

[humphriesbr@me.com]

Excellent

[Joy Chen]

Gracias!