A preexperimental design that explores a single event, person, or group in great detail is known as:

The research on infants' speech perception suggests that

a. infants can appreciate phoneme similarities shortly after birth, but they cannot appreciate phoneme differences until they are almost 12 months old. b. infants have such limited skills that psychologists cannot design appropriate research on speech perception in infants younger than 6 months of age. c. infants can perceive the differences between a variety of similar phonemes; this ability is present either at birth or during the first weeks of life. d. the perception of phonemes does not change after the age of 6 months.

Some of the people in Jacqueline's aerobics class are in a better mood after their half-hour workout, but others are short tempered and irritable after class. In this example, there is:

a. low consensus b. low consistency c. high distinctiveness d. low distinctiveness