Although nonexperiments resemble true experiments, they contain ...

[Capo]

Although nonexperiments resemble true experiments, they contain ____ and cannot ____.
 
  a. threats to internal validity; generalize to other situations
  b. threats to external validity; generalize to other situations
  c. threats to internal validity; establish causal relationships
  d. threats to external validity; establish causal relationships

Question 2

The questionnaire item Please add any other comments is an example of an unstructured response format.
 
  a. True
  b. False
  Indicate whether the statement is true or false

[ankilker]

Answer to Question 1

c

Answer to Question 2

True

[Capo]

TYSM

[xiazhe]

Thanks for the timely response, appreciate it