According to Hersen and Barlow, although the A-B design makes it ...

[APUS57]

According to Hersen and Barlow, although the A-B design makes it difficult to show causality, it
  is often used because
 
  A) statistical analysis is more difficult for more complex single-case designs
  B) of the inability or undesirability of returning to the baseline in a third stage
  C) it is easier to conduct
  D) funding agencies are more willing to support A-B designs

Question 2

The tails of a distribution will never actually touch the baseline, but extend into infinity. The tails
  of a distribution are therefore described as
 
  A) linear B) asymptotic C) leptokurtic D) homogenous

[sierramartinez]

Answer to Question 1

B

Answer to Question 2

B

[APUS57]

Thank you!

[sierramartinez]

Happy to help