Sol is investigating the effects of divorce on children's self-esteem. His initial sample consists of a group of 10 five-year-olds, which he plans to follow over a period of at least 15 years. When this group of children reaches age 15, Sol adds a second group of five-year-olds to his study, and plans to follow them for another 15 years. Sol's overall plan is best classified as a _____ research

Suppose that you are calculating your recent expenses, and you are adding up five 2-digit numbers in your head. As you begin to calculate the final sum, you feel that you've reached the limits of your memory. This strain can be traced to

a. the difficulty of keeping all this material in your working memory. b. the difficulty of transferring material from working memory to long-term memory. c. a conflict between top-down and bottom-up processing. d. material that is larger than the span of sensory memory.

Many babies who are put to sleep on their backs resist "tummy time" and as a result, they do not ______ before they walk

Fill in the blank with correct word