The _____ of an experiment is the extent to which the results can ...

[magmichele12]

The _____ of an experiment is the extent to which the results can be generalized or applied to situations outside the experimental situation.
 
  a. internal validity c. internal reliability
  b. external validity d. external reliability

Question 2

One reason for using multiple treatment conditions is that the researcher might want to manipulate the _____ of the independent variable.
 
  a. presence c. amount
  b. type d. absence

[daiying98]

Answer to Question 1

B
This is the definition of external validity.

Answer to Question 2

B
Type manipulations often use ore than two levels of the independent variable because the effects might depend on which type of the variable was in effect at the time the behavior was recorded.

[magmichele12]

Thank you

[daiying98]

No problem