Most social psychologists have decided that a p value of .05 or less is the cutoff for "statistical significance." Do you think that a 5% chance of patterns being found by chance is a low enough number? Or, do you think it should be higher-would 10% be good enough for you to feel confident?

Which of the following represents a positive correlation?

a. Jack has a higher level of education and a higher than his brother, Tim. b. Tim has less education than his brother, Jack, but he makes more money. c. Jack has a high level of education and Tim likes to waterski. d. Tim has more education than his brother, Tim, but also has children.

Psychostimulants generally would be expected to

a. increase heart rate and blood pressure b. reduce sympathetic nervous system activity c. shift EEG frequencies to lower frequencies d. all of the above