Which of the following is NOT a threat to the internal validity of an experiment?

During middle childhood ______________

a. children are less content than in adolescence mostly because they do not have the social skills required to manage peer conflict b. it is harder for children to hide their emotions than in early childhood because they become so much more intense at this period of development c. children are aware that they can experience two contradictory emotions at once d. the ability to self-regulate decreases from early childhood, mostly because of the many different contexts they experience

A high school student does extremely well on the verbal portion of the SAT. When asked how she studied for the test, the student said, "I didn't really study, but I do work a lot of crossword puzzles"

What kind of benefit has the student likely gotten from her crossword habit? a) Practice has increased her knowledge of the verbal domain b) Working crosswords has given her heightened insight into verbal problems. c) Doing puzzles has increased her recursive thinking skills. d) Exposure to puzzles has increased her skill at solving ill-defined problems.