Women can bear children from the first ovulation until

_____ is credited with developing the theory of classical conditioning

Fill in the blank with correct word

Ken is planning on studying the influence of intelligence on the ability to recall events from the 1960s. If Ken does not account for variables, such as age, that could also influence one's ability to recall these events, age could be considered a(n) ________ variable.

a) random b) dependent c) extraneous d) independent