When differences between the experimental group and the control group are so large that they could not have occurred simply by chance, they are considered to be ______

Which of the following is true about the development of sadness in infants?

a. Infants with depressed mothers are more likely to show sadness because of a genetic predisposition to depression. b. Infants with depressed mothers are less likely to show sadness because they use social smiles to attempt to cheer up their mothers. c. Infants with depressed mothers show the same level of sadness as other infants because the development of emotions is largely innate. d. Infants with depressed mothers are more likely to show sadness because they see more sadness from their mothers.

After having a very large meal at her mother's house, Stefani complains that she is "too full to move."

Soon after, Stefani's aunt arrives with a strawberry pie, which is Stefani's favorite, and Stefani eats three large pieces of the pie. Stefani's eating of the pie after having a large meal is best explained by the a. "pull" of external stimuli. b. "push" of internal needs. c. process of homeostasis. d. drive reduction of stimulus motives.