Instead of making one pretest and one posttest measure, the ...

[futuristic]

Instead of making one pretest and one posttest measure, the ___________________ _ makes a longer series of observations before and after introducing an experimental treatment.
 
  Fill in the blank(s) with correct word

Question 2

When random assignment to experimental and control groups is not possible the researcher may be forced to use a(n) ___________________ _ design.
 
  Fill in the blank(s) with correct word

[bookworm410]

Answer to Question 1

interrupted time-series design

Answer to Question 2

nonequivalent-group

[futuristic]

Thanks for the timely response, appreciate it

[essyface1]

Gracias!