Salina was terrified during the Loma Prieto, California, earthquake on October 17, 1989. Within two days of the earthquake and for a couple of weeks afterward, among other responses, Salina was very anxious, did not sleep well, and did not feel comfortable inside a building. However, gradually these reactions diminished, disappearing altogether by the end of the month. Her reaction to the earthquake most likely reflected _______________

Suppose I am interested in knowing whether adults who are very introverted at age 20 are still highly introverted at age 50. Which of the following statistical analyses will I be most likely to use?

a. a comparison of average introversion scores for a sample of adults aged 20 and another sample aged 50 b. a comparison of average introversion scores at age 20 and age 50 for the same adults assessed longitudinally c. an analysis of the average amount in introversion between any two measurements of the same people over time d. a calculation of the correlation between scores on the key variable at two time points in a group of subjects studied longitudinally between age 20 and age 50

Scientists are likely to do which of the following in naturalistic observation?

A) Manipulate a variable and observe its effects on a second variable. B) Interview subjects about their attitudes and lifestyle. C) Learn about people's behavior by directly interacting with them. D) Watch the behavior of animals and humans where it happens.