6.5 Stiger, Barnhart, and Williamson (1999) analyzed a double-blind clinical trail that compared a hypnotic drug to a placebo in subjects with insomnia. The researchers surveyed each patient about the amount of time it took them to go to sleep prior to treatment and again after 2 weeks of treatment. The data follow. Perform a thorough analysis of these data using the robust approach.

Time to Falling asleep (min) Follow-up Treatment Active Total Proposition Placebo Total Proportion Initial < 20 20-30 30-60 > 60 < 20 20-30 30-60 > 60 < 20 7 11 13 9 40 0.336 7 14 6 4 31 0.258 20-30 4 5 23 17 49 0.412 4 5 9 11 29 0.242 30-60 1 2 3 13 19 0.16 2 1 18 14 35 0.292 > 60 0 2 1 8 11 0.092 1 0 2 22 25 0.208 Total 12 20 40 47 119 14 20 35 51 120 Proportion 0 101 0 168 0 336 0 395 011 7 0 167 0-292 0-425