In your study, you plan to enroll OSA patients and non-OSA patients with the ratio of 1:2. Smoking prevalence in the general adult population is 15%. Your hypothesis is that smoking prevalence in OSA patients is twice as high as the general population. Compute the sample size needed for each group and the total, using =0.05 and power of 80%. (Recommended online calculator: Open Epi by Emory University: https://www.openepi.com/Menu/OE_Menu.htm Please indicate what formula was used - Kelsey's or Fleiss's)