With regard to cognitive development in mid-adulthood, with enough expertise a substantial part of problem-solving becomes ____

What can we conclude from the observation that retrieving an item from short-term memory takes longer as items are added to STM?

a) STM processing is not efficient. b) The capacity of STM is unlimited. c) We apparently scan every item in STM before reporting. d) The items added to STM must have been more difficult than the previous items.

The coefficient of correlation conveys:

a. the size and direction of the relationship between two variables. b. whether one variable causes the other variable to happen. c. the unintended changes in a subject's behavior due to the experimenter's cues. d. whether or not the principle of falsifiability applies to each variable.