网课知到Medical Statistics智慧树答案（医学统计学）

第一章 单元测试

1、单选题：Which of the following belongs to continuous numerical variable?（ ）

A:gender.

B:country

C:age

D:blood type

正确答案:【age】

2、单选题：What is the range of probability P for a random event? （ ）

A:-1≤P≤0

B:P =1

C:0≤P≤1

D:-1≤P≤1

正确答案:【0≤P≤1】

3、单选题：Which of the following cannot be avoided during sampling? （ ）

A:sample size is too small

B:personal error

C:sample size is too large

D:sampling error

正确答案:【sampling error】

4、单选题：Low, median and high belong to _____? （ ）

A:Raw data

B:Ordering data

C:Measuring data

D:Counting data

正确答案:【Ordering data】

5、单选题：Which of the following belongs to discrete numerical variable ________? （ ）

A:Weight

B:Number of children in a family

C:Height

D:Cancer degree

正确答案:【Number of children in a family】

6、单选题：Which one of the following variables is not categorical? （ ）

A:Age of a person.

B:Gender of a person: male or female.

C:Choice on a test item: true or false.

D:Marital status of a person (single, married, divorced, other)

正确答案:【Age of a person.】

7、单选题：Which of the following belongs to the measurement data ________. （ ）

A:WBC counts

B:gender

C:blood type

D:curative effect

正确答案:【WBC counts】

8、单选题：Which of the following belongs to categorical variable ________. （ ）

A:gender of people in a specific region.

B:heart rate

C:score of IQ

D:days staying in hospital

正确答案:【gender of people in a specific region.】

第二章 单元测试

1、单选题：The measure of dispersion most commonly used in conjunction with the arithmetic mean is the: （ ）

A:interquartile range

B:variance

C:range

D:standard deviation

正确答案:【standard deviation】

2、单选题：Simply by scanning the values in each distribution below, identify the distribution with the smallest standard deviation.（ ）

A:9, 9, 9, 10, 10, 10, 10, 11, 11, 11

B:80, 80, 80, 80, 80, 80, 80, 80, 80, 80

C:7, 8, 9, 10, 11, 12, 13, 14, 15, 16

D:6, 6, 9, 10, 11, 12, 14, 17, 20, 90

正确答案:【80, 80, 80, 80, 80, 80, 80, 80, 80, 80】

3、单选题：The most commonly used measure of central location for antibody titers is the:（ ）

A:arithmetic mean

B:geometric mean

C:median

D:mode

正确答案:【geometric mean】

4、单选题：Which range characterizes the interquartile range?（ ）

A:From 10th percentile to 90th percentile

B:From 1.96 standard deviations below the mean to 1.96 standard deviations above the mean

C:From 5th percentile to 95th percentile

D:From 25th percentile to 75th percentile

正确答案:【From 25th percentile to 75th percentile】

5、单选题：All of the following are measures of dispersion EXCEPT: （ ）

A:median

B:range

C:standard deviation

D:interquartile range

正确答案:【median】

第三章 单元测试

1、单选题：Which of the following is not applicable to describe categorical data? （ ）

A:Proportion

B:Rate

C:Mean

D:Ratio

正确答案:【Mean】

2、单选题：Which of the following refers to the frequency of a given event during or after a certain time period? （ ）

A:Mean

B:Ratio

C:Proportion

D:Rate

正确答案:【Rate】

3、单选题：Which of the following is TRUE? （ ）

A:The ratio can be used to explain the frequency.

B:The frequency is a time-dependent indicator.

C:If the total number of observations is not sufficient, the results should be expressed in relative number.

D:When the rate is computed based on a sample data, it usually should be adjusted according to the composition of the population

正确答案:【When the rate is computed based on a sample data, it usually should be adjusted according to the composition of the population】

4、单选题：There are 120 patients with a certain disease, including 114 males and 6 females, accounting for 95% and 5% respectively. The conclusion is （ ）

A:No conclusion can be drawn

B:The susceptibility rates of male and female patients are the same.

C:The disease is easy to get in men.

D:The disease is easy to get in women

正确答案:【No conclusion can be drawn】

5、单选题：The crude mortality of malignant tumors in county A is higher than that in County B. After standardization, the standardized mortality of malignant tumors in county A is lower than that in County B. The most likely reason is （ ）

A:High diagnostic level in county A

B:The proportion of the elderly population in the total population in county A is larger than that in County B

C:The proportion of the elderly population in the total population in county A is smaller than that in County B

D:The cancer prevention and treatment work in county A is better than that in County B

正确答案:【The proportion of the elderly population in the total population in county A is larger than that in County B】

第四章 单元测试

1、单选题：Which of the following statistical charts applies to a continuous variable （ ）

A:Histogram

B:Scatter graph

C:Bar graph

D:Line graph’

正确答案:【Histogram】

2、单选题：Pie charts can be used to describe （ ）

A:the development speed of phenomena

B:the changing trend of phenomena

C:the frequency distribution of phenomena

D:the internal structure of phenomena

正确答案:【the internal structure of phenomena】

3、单选题：Which of the following statistical table is not made correctly （ ）

A:The more information in a table, the better

B:The numbers in the table are aligned to the decimal places

C:The title of the statistical table is placed at the top of the table

D:Statistical tables generally use headers to indicate the meaning and units of the data

正确答案:【The more information in a table, the better】

4、单选题：To compare the incidence rate of three diseases in a certain area in a certain year, we can draw （ ）

A:circular chart

B:line chart

C:histogram

D:straight bar chart

正确答案:【straight bar chart】

5、单选题：To represent the component ratio of various causes of death in a certain place in a certain year, we can draw （ ）

A:straight bar chart

B:histogram

C:circular chart

D:line chart

正确答案:【circular chart】

第五章 单元测试

1、单选题：The smaller the Standard error of sample mean is, （ ）

A:the greater the reliability of estimating the population mean from the sample mean

B:the smaller the variation of the observed individual

C:the greater the sampling error is

D:the larger the variation of the observed individual

正确答案:【the greater the reliability of estimating the population mean from the sample mean】

2、单选题：The cause of sampling error is （ ）

A:individual differences

B:measurement is inaccurate

C:sample is not randomly selected

D:data are not normally distributed

正确答案:【individual differences】

3、单选题：According to the sample data, the 95% confidence interval of white blood cell count in healthy adults is , which means （ ）

A:The probability that this interval contains the population mean is 95%

B:The probability of the overall mean in this interval is 95%

C:It is estimated that 95% of the observations in the population are within this range

D:The probability that this interval contains the sample mean is 95%

正确答案:【The probability that this interval contains the population mean is 95%】

4、单选题：When sampling from a population of measurement data. If the sample size is increased, there will be （ ）

A:decrease of standard error

B:increase in standard deviation

C:increase of standard error

D:decrease in standard deviation

正确答案:【decrease of standard error】

5、单选题：In the same population, multiple random samples are used to estimate the 95% confidence interval of the population mean. The most reliable is （ ）

A:samples with large standard error

B:samples with small mean

C:samples with small standard error

D:samples with small standard deviation

正确答案:【samples with small standard error】

第六章 单元测试

1、判断题：If the P-value is larger than 0.05, the null hypothesis is true. （ ）

A:对

B:错

正确答案:【错】

2、判断题：Practical s