Calculate the degrees of freedom for a single-sample t test with 18 subjects

If we briefly flashed the image of an orange to the right field of vision of an individual after split-brain surgery, they will most likely say they see _____

a) nothing. b) an orange. c) something but be unable to name it. d) only something round.

Which German psychologist gathered data that is now referred to as the forgetting curve?

a. Hermann Ebbinghaus b. Wilhelm Wundt c. E.B. Titchener d. Karl Wertheimer