2021 商务统计(东北财经大学)1464567441 最新满分章节测试答案

本答案对应课程为:点我自动跳转查看
本课程起止时间为:2021-05-25到2021-08-31
本篇答案更新状态:已完结

第一章 什么是统计学 第一单元测试

1、 问题:The general process of gathering, organizing, summarizing, analyzing, and interpreting data to assist in making effective decisions is called:
选项：
A:statistics.
B:descriptive statistics.
C:inferential statistics.
D:levels of measurement.
答案: 【statistics.】

2、 问题:A sample is:
选项：
A:at least 15 observations.
B:a group of people.
C:part of a population.
D:a set of frequencies.
答案: 【part of a population.】

3、 问题:The main purpose of inferential statistics is to:
选项：
A:summarize data in a useful and informative manner.
B:estimate population characteristics based on a sample information.
C:determine if the data adequately represents the population.
D:gather or collect data.
答案: 【estimate population characteristics based on a sample information.】

4、 问题:To study the characteristics of loan applicants, a random sample of 50 loan applicants is selected and their annual incomes are obtained. Which level of measurement is annual income?
选项：
A:Nominal
B:Ordinal
C:Interval
D:Ratio
答案: 【Ratio】

5、 问题:The main purpose of descriptive statistics is to:
选项：
A:summarize data in a useful and informative manner.
B:estimate a population characteristic based on a sample.
C:determine if the data adequately represents the population.
D:gather or collect data.
答案: 【summarize data in a useful and informative manner.】

6、 问题:A bank asks customers to evaluate the quality of drive-through service as good, average, or poor. Which level of measurement is used to measure service quality?
选项：
A:Nominal
B:Ordinal
C:Interval
D:Ratio
答案: 【Ordinal】

7、 问题:The main purpose of descriptive statistics is to:
选项：
A:summarize data in a useful and informative manner.
B:estimate a population characteristic based on a sample.
C:determine if the data adequately represents the population.
D:gather or collect data.
答案: 【summarize data in a useful and informative manner.】

8、 问题:Gallup political polls ask people their political party affiliation – Democrat, Republican or Independent. Which level of measurement is used to measure party affiliation?
选项：
A:Nominal
B:Ordinal
C:Interval
D:Ratio
答案: 【Nominal】

9、 问题:What type of variable is: number of car accidents reported in your city?
选项：
A:Attribute
B:Continuous
C:Discrete
D:Qualitative
答案: 【Discrete】

10、 问题:Data measured with an ordinal scale:
选项：
A:can be ranked.
B:have a meaningful value of zero.
C:have meaningful differences between values.
D:are quantitative.
答案: 【can be ranked.】

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:For a distribution, the mean is 5, the median is 15, and the mode is 20. Based on this information, the distribution is:
选项：
A:positively skewed.
B:negatively skewed.
C:symmetric.
D:bell-shaped.
答案: 【negatively skewed.】

8、 问题:In a positively skewed distribution, which measure of central tendency is the largest?
选项：
A:Mean
B:Median
C:Mode
D:Variance
答案: 【Mean】

9、 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】

10、 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：

请输入手机号或商家订单号

打不开请联系客服QQ 2356025045 商家订单号在哪里？点此了解

---

商家订单号查看步骤

打开支付宝

方法一：我的 > 账单 > 账单详情 > 更多>复制商家订单号

方法二：我的 > 账单 >搜索关键字【网课小帮手】
> 账单详情 > 更多>复制商家订单号

方法三：联系客服QQ 2356025045

微信支付

我 > 支付 > 钱包 > 账单 > 账单详情

手机号用于查询订单，请认真核对

支付宝