We can use the information in Q6 to calculate that the^!statistic for the observed data to show that it is4.82(which you do not need to do).One important part of this process is to calculateO- E foreachcellinthecontingencytable.Brieflyexplainwhythisdifferenceisuseful.[Hint:Thinkabout what E represents and then what large differences for O - E might tell us.]

Hospital Presentation less than 90 days No Yes Total Control 27 21 48 E = 32. 16 E = 15.8 4 Treatment 40 12 52 E = 34. 84 E = 17.1 6 Total 67 33 100