Preschool age children have no knowledge of racial and ethnic identity

The result of the Hawthorne studies aimed at finding the optimal level of

illumination for assembly workers was that (a) as illumination increased, productivity increased (b) as illumination increased, productivity decreased (c) as illumination decreased, productivity increased (d) when illumination stayed constant, productivity increased (e) A, C and D but not B

In which type of learning is an antecedent stimulus that does not produce a response linked with a stimulus that does produce the response?

a. classical conditioning b. operant conditioning c. cognitive learning d. instrumental learning