大学MOOC Medical Statistics(Sun Yat-sen University)1461844163 最新慕课完整章节测试答案

Simple Linear Regression

1、单选题：

​In simple linear regression analysis, if determination coefficient =1, then must hold_________. 

‎选项：
A: r=0
B: r>0
C: r<0
D: r =1 or r =-1
E: b =1 or b =-1
答案: 【 r =1 or r =-1】

2、单选题：

‍We get Pearson’s correlation coefficient r >0. For the same set of data, regression equation is . Which of the following is true?

‌选项：
A: a>0
B: a<0 
C: b=0 
D:  b<0
E: b>0
答案: 【 b>0】

3、单选题：
‏In linear regression analysis, the larger the         is, the better the regression model will fit.‍
选项：
A: intercept
B: slope
C: regression coefficient
D: determination coefficient
E: t value when testing the significance of slope
答案: 【 determination coefficient】

4、单选题：
‍The linear correlation and linear regression analyses were conducted based on the same sample, and correlation coefficient r is of statistical significance (P<0.001). Then, which of the following statement is correct          ‌
选项：
A:  the slope b in regression analysis is of no statistical significance.
B: the slope b in regression analysis is of highly statistical significance.
C: the slope b in regression analysis is of statistical significance.
D: it is still uncertain whether the slope b in the regression analysis is of statistical significance.
E: the intercept a in regression analysis is of statistical significance.
答案: 【 the slope b in regression analysis is of statistical significance.】

5、单选题：
‎Conducting both linear correlation and linear regression analysis for X and Y, which one of the following statements is correct?‏
选项：
A: rb≥0 
B: rb≤0 
C: r＞0，b＜0
D: r＜0，b＞0
E: r＝b
答案: 【 rb≥0 】

Statistical Principles of Experimental Design

1、单选题：
‎What is the difference between experimental group and control group? ‏
选项：
A: Treatment
B: Effect
C: Sampling error
D: Observation time
E: Location
答案: 【 Treatment】

2、单选题：
‍The best control method for confounding bias is _________.​
选项：
A: Restriction
B:  Matching
C: Random grouping
D: Balanced processing
E: Statistical processing
答案: 【 Random grouping】

3、单选题：
‍In the case-control study of obesity and hypertension, the cases were from patients found by medical examination in a hospital, and the control was an employee of an enterprise located in the hospital. The design may exist      . ‌
选项：
A: Sampling error
B: Gross error
C: System error
D: Selection bias
E: Confounding bias
答案: 【 Selection bias】

4、单选题：
‎A doctor used a triple therapy to treat 120 cases of peptic ulcers, a total of 105 cases were observed to be effective, with an efficiency of 87.5%, so it is considered that this therapy has a better effect. The analysis       .‏
选项：
A: failure to implement the principle of randomization
B: insufficient sample size
C: no control group
D: failure to implement the principle of duplication
E: right
答案: 【 no control group】

5、判断题：
‌Inappropriate sampling methods may result in samples that do not represent the population well.​
选项：
A: 正确
B: 错误
答案: 【 正确】

Statistical Tables and Charts

1、判断题：
‎Using statistical tables and charts must be more clearly than text.‎
选项：
A: 正确
B: 错误
答案: 【 错误】

2、判断题：
‌Make sure the statistical tables and charts can stand alone from the text.‏
选项：
A: 正确
B: 错误
答案: 【 正确】

3、判断题：
‎Values to be compared should be placed side-by-side.‎
选项：
A: 正确
B: 错误
答案: 【 正确】

4、判断题：
‏Using charts is that a minimum of information can be conveyed in a maximum of space. ‍
选项：
A: 正确
B: 错误
答案: 【 错误】

5、判断题：
​Different academic journals sometimes give their own special regulations. ​
选项：
A: 正确
B: 错误
答案: 【 错误】

Probability and Distribution

1、单选题：
‌Which of the following conditions could make the binomial distribution B(n, π) approximate the Poisson distribution? ‌
选项：
A: When n is large and π approaches to 0.
B: When n®¥ .
C: When nπ or n(1-π) approaches to 0.5.
D: When n is large and π approaches to 0.5.
E: When π approaches to 0.5.
答案: 【 When n is large and π approaches to 0.】

2、单选题：
‍A certain measurement index shows a logarithmic normal distribution, which is considered as abnormal if it is too high, and which of the following should be used to calculate the range of medical reference value with a scope of 95%？‏
选项：
A:
B:
C:
D:
E:
答案: 【 】

3、单选题：
‍Which of the following statements about the probability is WRONG?‎
选项：
A: Probability is the measure of the likelihood that an event will occur.
B: Any probability takes value from the interval [0,1].