What makes a posttest only design a between subjects design? ...

[misspop]

What makes a posttest only design a between subjects design?
 
  a. It has repeated measures.
  b. It uses a filler task as a control.
  c. Different participants are assigned to the treatment and control conditions.
  d. It makes use of a one-tailed hypothesis.

Question 2

If you were manipulating the type of scenario (story) read by participants before performing a memory task, what task would be appropriate for the control group? They should
 
  a. read an equivalent story, but one that lacked the critical feature of the experimental story
  b. read exactly the same story as the experimental participants read
  c. take a placebo
  d. do nothing during this phase of the experiment

[xthemafja]

Answer to Question 1

C
In any between subjects design, there are different participants or subjects in the control and treatment conditions.

Answer to Question 2

A
Control tasks should be as similar to the experimental task as possible while still permitting the manipulation.