Medical Statistics（医学统计学）答案2023

第七章测试

1.When doing the hypothesis test, which situation may make the type 2 error? （ ）
A:If is false, P<0.05, reject B:If is true, P<0.05, reject , accept C:If is false, P>0.05, not reject D:If is true, P>0.05, not reject
答案:C
2.For the two independent samples t test, if both of the two sample size is n, then the degree of freedom is:（ ）
A:2n -1 B:2n -2 C:2n D:n -1 3.For two independent samples t test, the smaller the P value, then:（ ）
A:the greater reason to believe that the two populations are different B:the smaller the difference between the two populations C:the greater the difference between the two sample means D:the greater the difference between the two populations 4.For one sample t test, if t=8.91, , according to α=0.05, the correct conclusion is:（ ）
A: B: C: D: 5.Hemoglobin (Hb) of 25 lead-exposed works were tested, the mean of Hb was 130.83g/L, and SD is 25.74g/L. It is known that the average Hb of normal adult men is 140g/L. Is there any difference in Hb between lead-exposed workers and normal adult men? The appropriate hypothesis test is:（ ）
A:one sample t-test B:independent samples t-test C:matched or paired samples t-test D:not above test