Medical Statistics（医学统计学）答案2023

第九章测试

1.In which case, performing χ² test for four-fold table, the continuity correction is necessary.（ ）
A:T＜5 and n≥40 B:1≤T＜5 and n≥40 C:T≥5 or n≥40 D:T＜1 or n＜40
答案:C
2.In which case, performing χ² test for four-fold table, the continuity correction is necessary ? （ ）
A:T＜1 or n＜40 B:T≥5 or n≥40 C:T≥5 and n≥40 D:1≤T＜5 and n≥40 3.In which case, performing χ2 test for four-fold table, the Fisher exact test should be used ? （ ）
A:T＜1 or n＜40 B:1≤T＜5 and n≥40 C:T≥5 or n≥40 D:T≥5 and n≥40 4.The purpose of the test of difference between the two sample rates is （ ）
A:infer whether the difference between the two population rates is significant B:infer the difference between the two population rates C:infer whether the two sample rates are different D:infer whether there is a difference between the two sample rates and the two population rates 5.The degree of freedom of chi-square test is （ ）
A:(R-1) (C-1) B:R-1 C:C-1 D:RC-1