Suppose a researcher assessed attitudes towards a certain brand of soda before and after conducting a taste test and noted the following results: Pre Post 5 7 4 9 3 4 5 10 4 4 5 4 What is the mean difference?

Which of the following sentences describes an example of procedural memory?

a. "There are seven days in a week." b. "This professor always includes multiple-choice questions on her exams." c. "The earthquake occurred prior to the fire in that city." d. "To make a capital letter on this keyboard, press SHIFT."

Nick's parents suspected that their 20-year-old son might be addicted to drugs. His behavior was alternately erratic and depressed or highly energetic and loud. Their suspicions were confirmed when he

began receiving phone calls at all hours of the day and night. began displaying symptoms of withdrawal. seemed to always have a runny nose. stayed up until 3 A.M. on most nights and slept until noon.