deal with
effective
be invalid
total
Effective rate (%)
Nail medicine
53(a)
17(b)
70
75.7 1
B medicine
62(c)
13(d)
75
92.86
total
1 15
30
145(n=a+b+c+d
79.3 1
(1) Establish the hypothesis and determine the σ value.
H0:π？ =π? That is to say, the survival rate of the two treatments is equivalent.
H 1:π？ ≠π? That is, the survival rate of the two treatment methods is not equal.
TRC=nRnC/n
T minimum value = minimum total number of rows * minimum total number of columns/total number of columns =17×13/145 =1.21.
(2) Calculation and statistics
Because: T= 1.2 1.
So: x? =(|ad-bc-n/2|)？ n/(a+b)(c+d)(a+c)(b+d)
=(689- 1054- 145/2)? × 145/70×75× 1 15×30
= 1.53
(3) check x? Boundary value table, determine the p value and draw a conclusion.
x？ = 1.53￠x？ 0.05=3.84，P﹤0.05。 According to the test level of α=0.05, H0 was rejected and H 1 was accepted. The difference was statistically significant. It is considered that the two drugs have different effective rates, and the second drug is better than the first drug.