2020 保险统计(对外经济贸易大学) 最新满分章节测试答案

文章目录[隐藏]

第三章 Chapter 3 Describing Data： Numerical Measures 第三单元测验
第二章 Chapter 2 Describing Data： Frequency Tables, Frequency Distributions, and Graphic Presentation 第
第四章 Chapter 4 Describing Data： Displaying and Exploring Data 第四单元测验

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本课程起止时间为:2020-02-24到2020-08-31
本篇答案更新状态:已完结

第三章 Chapter 3 Describing Data： Numerical Measures 第三单元测验

1、问题:A key difference between calculating the sample mean and the population mean is:
选项：
A:we use and n instead of μ and N.
B:we divide the sum of the observations by n – 1 instead of n.
C:the sample observations are ranked and the middle value is selected as the population mean.
D:there are no differences.
答案: 【we use and n instead of μ and N.】

2、问题:Which of the following measures of central location is affected most by extreme values?
选项：
A:Median
B:Mean
C:Mode
D:Variance
答案: 【Mean】

3、问题:The Empirical Rule states that:
选项：
A:for a bell shaped frequency distribution, approximately 68% of the observations are in the range of plus or minus one standard deviation.
B:for a positively skewed frequency distribution, approximately 68% of the observations are in the range of plus or minus one standard deviation.
C:for a bell shaped frequency distribution, approximately 75% of the observations are in the range of plus or minus one standard deviation.
D:for a positively skewed frequency distribution, approximately 75% of the observations are in the range of plus or minus one standard deviation.
答案: 【for a bell shaped frequency distribution, approximately 68% of the observations are in the range of plus or minus one standard deviation.】

4、问题:Which measure of central tendency reports the value that occurs with the highest frequency?
选项：
A:Mean
B:Median
C:Mode
D:Standard deviation
答案: 【Mode】

5、问题:An example of Chebyshev’s Theorem is:
选项：
A:for a bell shaped frequency distribution, at least 95% of the observations are in the range of plus or minus two standard deviations from the mean.
B:for a negatively skewed frequency distribution, at least 95% of the observations are in the range of plus or minus two standard deviations from the mean.
C:for any frequency distribution, at least 75% of the observations are in the range of plus or minus two standard deviations from the mean.
D:for a positively skewed frequency distribution, at least 68% of the observations are in the range of plus or minus two standard deviations from the mean.
答案: 【for any frequency distribution, at least 75% of the observations are in the range of plus or minus two standard deviations from the mean.】

6、问题:In comparing two different samples of 100 observations, sample "A" has a mean of 10 and a standard deviation of 10. The sample "B" has a mean of 10 and a standard deviation of 50. The two samples are:
选项：
A:exactly the same.
B:are centered at 10, but sample "A"s data is more concentrated near the mean.
C:are centered at 10, but sample "B"s data is more concentrated near the mean.
D:positively skewed.
答案: 【are centered at 10, but sample "A"s data is more concentrated near the mean.】

7、问题:Which of the following statistics is a measure of dispersion?
选项：
A:Mean
B:Median
C:Mode
D:Standard deviation
答案: 【Standard deviation】

8、问题:What is true about the range?
选项：
A:Only two values are used in its calculation.
B:It is in different units than the mean.
C:It can be used for nominal data.
D:All values are used in its calculation.
答案: 【Only two values are used in its calculation.】

第二章 Chapter 2 Describing Data： Frequency Tables, Frequency Distributions, and Graphic Presentation 第

1、问题:In a frequency distribution the classes must:
选项：
A:be mutually exclusive.
B:have a maximum of 10 observations.
C:have equal frequencies.
D:be measured on a nominal scale.
答案: 【be mutually exclusive.】

2、问题:For a frequency distribution, the class interval is:
选项：
A:the class frequencies divided by two.
B:the class frequency divided by the number of observations.
C:the difference between consecutive lower class limits.
D:the number of observations in the class.
答案: 【the difference between consecutive lower class limits.】

3、问题:For a frequency distribution, a class frequency is:
选项：
A:the number of observations in the class.
B:the difference between consecutive lower class limits.
C:limited to a maximum of 10 observations.
D:the total number of observations in the sample.