Question 56

5. Some researcher have observed greater airway resistance in smokers than in nonsmokers. Suppose a study, conducted to compare the percent of tracheobronchial retention of particles in smoking-discordant monotygotlc twice. yield ed the following results: Wm__ \" Do these data support the hypothesis that tracheohronchial clearance is slower in smokers? Let c. = [1111. [#148, Accept HE!) E. M graders were randomly selected from a school district. Then. they were divided into 12 matched pairs, each pair trailing equal life. One member of each pair was randomly selected to recelye special training. Then, all of the students were given an IQ test. The results are summarised below. Do these results provide evidence that the special training helped or hurt student performance? Use a ELIE! level of significa rice. Assume that the mean difference are approximately normally distribute. [t=-.4?, Accept HID]