The problem with static group comparison designs is that _____. ...

[tuffie]

The problem with static group comparison designs is that _____.
 
  a. there are too many independent variables
  b. there are too many unknown differences between the groups
  c. there are too many dependent variables
  d. the random assignment technique didn't result in equivalent groups

Question 2

In observational studies the researcher manipulates the experiment and observes the results closely.
 
  Indicate whether the statement is true or false

[14vl19]

Answer to Question 1

B
When random assignment is not used to form the comparison groups, it is impossible to know what caused the differences observed between the groups.

Answer to Question 2

F

[tuffie]

Thanks for the timely response, appreciate it

[abro1885]

YES! Correct, THANKS for helping me on my review