The sample mean is appropriately used to describe data on which scale of measurement?

Lisa picks up her electric razor and turns it on. She immediately senses vibrations

coming from it because the razor is stimulating a. free nerve endings. b. muscle spindles. c. Pacinian corpuscles. d. vestibular sacs. e. specialized receptors.

In a study in which infants were exposed to a mobile, those who looked at a mobile that

remained stationary a. kept trying to make it move. b. turned their heads to avoid looking at it. c. did not learn to control its movements when given the opportunity. d. were more easily frustrated by difficult problems later. e. were not able to easily focus on its detailed features.