Medical Statistics（医学统计学）答案2023

第八章测试

1.The basic idea and key points of ANOVA are （ ）
A:The mean square between group is greater than the mean square within group B:The mean square within group is greater than the mean square between group C:The ratio of two variances obeys F distribution D:The total variation and its degree of freedom can be decomposed according to different sources
答案:D
2.One of the application conditions of ANOVA is homogeneity of variance （ ）
A:Variance between group = Variance within group B:The corresponding population variance of each comparison group is equal C:Total variance = Variance between group+ Variance between group= Variance within group D:The corresponding sample variance of each comparison group is equal. 3.The mean square between groups in completely randomized design analysis of variance reflects that （ ）
A:The average level of variance in each group B:Random measurement error size C:Processing factor effect and random error D:Effect size of a certain factor 4.For the comparison of the two groups of data, the relationship between ANOVA and t-test was as follows （ ）
A:T test results are more accurate B:Approximate equivalence C:Complete equivalence D:Analysis of variance results are more accurate 5.In an analysis of variance of multi groups, if p<0.05, what we should do next? （ ）
A:Test for normality B:Multiple comparison C:Test for homogeneity of variance D:T-test of two means