A study was done looking at communication between adolescents with asthma and their health care provider. Forty-six providers from four pediatric practices in North Carolina agreed to participate in the study. Two clinics were in rural areas and two were in suburban areas of North Carolina. adolescent patients who agreed to participate were randomized, along with their caregiver, into either the intervention group in the usual care group. the intervention group watched a video on an ipad and then completed an asthma question prompt list before their visits. all visits were audiotape recorded. a secondary analysis of transcripts from these medical visits of adolescents, ages 11-17 years, discovered that 44% (81 out of 185) of the adolescents and/or their providers from the intervention group discussed tobacco smoking in a visit versus 32% (56 out of 174) in the control group. from these results we can compute 3 different 95% confide intervals using the same proportion (p) from this study.

a) For estimate, pi = 0.44, 95% Cl: (0.37, 0.51)
b) For estimate, pc = 0.32, 95% Cl: (0.25, 0.39)
c) For estimate, pi - pc = 0.44 -0.32 = 0.12, 95% Cl: 0.02, 0,22).
1. Describe the population that is the sample was selected from.