【单选题】为比较A.B两种药物对治疗婴儿肺炎的疗效,某医生考虑到病情轻重对疗效的影响,要求A.B药应用者中必须有不同病情者,且比例相同并以入院日期逢单者用A药,逢双者用B药,问A.B两药的疗效有无差别
B.
P<0.05.两样本均数有差别< /div>
C.
P<0.05.两总体均数有差别< /div>
【单选题】为比较A.B两种药物对治疗婴儿肺炎的疗效,某医生考虑到病情轻重对疗效的影响,要求A.B药应用者中必须有不同病情者,且比例相同并以入院日期逢单者用A药,逢双者用B药,问A.B两药的疗效有无差别
【单选题】为比较A.B两种药物对治疗婴儿肺炎的疗效,某医生考虑到病情轻重对疗效的影响,要求A.B药应用者中必须有不同病情者,且比例相同并以入院日期逢单者用A药,逢双者用B药,问A.B两药的疗效有无差别
【简答题】What We Wish My dear child, 1 As we drove off from your college, I wanted to write a letter to tell you all that is on my mind. 2 First, I want to tell you how proud we are. Getting into college is re...