8. Snacking and TV Psychologists believe that excessive eating may be associated with emotional states

(being upset or bored) and environmental cues (watching television, reading, and so on). To test this theory, suppose you randomly selected 60 persons and matched them by weight and gender in pairs. For a period of 2 weeks, one of each pair spends evenings reading novels of interest to him or her, while the other spends each evening watching television. You record x519, the number of pairs for which the television watchers’ calorie intake exceeded the intake of the readers. If there is no difference in the effects of television and reading on calorie intake, the probability p that the calorie intake of one member of a pair exceeds that of the other member is .5. Do these data provide sufficient evidence to indicate a difference between the effects of television watching and reading on calorie intake? (hint: Calculate the z-score for the observed value, x519.)