In a study that examined mental health care among individuals living in certain areas of Cedar Falls, Iowa, groups of participants from randomly selected city blocks were surveyed. This is an example of ____ sampling

Dixon suggests the cognitive changes that take place as we age should be examined in terms of "gains and losses." What is one area of gain?

a. increased useful field of view b. increased traditional problem-solving skills c. increased compensatory skills d. increased working memory

Charlie practices the piano every day after school because he loves music and finds playing the piano enjoyable. In this example, Charlie's behavior is:

a. extrinsically motivated b. intrinsically motivated c. self-serving d. unmotivated