Simone observed a group of adults at the local shopping mall. She recorded the length of time (in minutes) they stayed and the number of purchases they made, and then analyzed her data to see if there was a relationship between these two variables. What type of study is this called?

In a study comparing Japanese and Americans, the Japanese reported that their sense of self, in different situations, changes

a. 5 percent to 10 percent. b. 20 percent to 30 percent. c. 55 percent to 59 percent. d. 90 percent to 99 percent.

Compared to infants of mothers who are not depressed, infants of depressed mothers

A) have patterned sleep–wake cycles. B) are less attentive to their surroundings. C) have depleted cortisol levels. D) cry less often.