大学MOOC 商务统计－刘迎春（3321199307）(东北财经大学)1452521201 最新慕课完整章节测试答案
慕课 第一章 什么是统计学
文章目录
- 慕课 第一章 什么是统计学
- 慕课 第七章 Chapter 7 Continuous Probability Distributions
- 慕课 第三章 Chapter 3 Describing Data Numerical Measures
- 慕课 第九章 Chapter 9 Estimation and Confidence Intervals
- 慕课 第二章 Chapter 2 Describing Data Frequency Tables, Frequency Distributions, and Graphic Presentation
- 慕课 第五章 Chapter 5 A Survey of Probability Concepts
- 慕课 第八章 Chapter 8 Sampling Methods and the Central Limit Theorem
- 慕课 第六章 Chapter 6 Discrete Probability Distributions
- 慕课 第十一章 Chapter 11 Two-sample Tests of Hypothesis
- 慕课 第十章 Chapter 10 One Sample Tests of Hypothesis
- 慕课 第四章 Chapter 4 Describing Data Displaying and Exploring Data
第一单元测试
1、单选题：
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、单选题：
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、单选题：
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、单选题：
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、单选题：
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、单选题：
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、单选题：
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、单选题：
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、单选题：
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、单选题：
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.】
慕课 第七章 Chapter 7 Continuous Probability Distributions
第七单元测试
1、单选题：
A random variable, time to load a delivery truck, is uniformly distributed. The distribution is defined by the:
选项：
A: minimum and maximum times to load a delivery truck.
B: maximum time to load a delivery truck.
C: minimum time to load a delivery truck.
D: standard deviation of the time to lead a delivery truck.
答案: 【 minimum and maximum times to load a delivery truck.】
2、单选题：
A uniform distribution's shape is:
选项：
A: bell shaped.
B: positively skewed.
C: negatively skewed.
D: rectangular.
答案: 【 rectangular.】
3、单选题：
The normal distribution is a _____ distribution.
选项：
A: discrete
B: continuous
C: positively skewed
D: rectangular
答案: 【 continuous】
4、单选题：
A normal distribution can be described as a/an ____ distribution.
选项：
A: bell-shaped
B: summertic
C: asymptotic
D: All of the above
答案: 【 All of the above】
5、单选题：
If a random variable is normally distributed:
选项：
A: the random variable cannot assume negative numbers.
B: the distribution is defined by the mean and standard deviation of the random variable.
C: the probability that the random variable is greater than the mean is 0.60.
D: the probability that the random variable is greater than the mean is 0.60.
答案: 【 the distribution is defined by the mean and standard deviation of the random variable.】
6、单选题：
Which of the following statements is correct regarding the standard normal distribution?
选项：
A: It is also called the z distribution.
B: Any normal distribution can be converted to the standard normal distribution.
C: The mean is 0 and the standard deviation is 1.
D: All of the above are correct.
答案: 【 All of the above are correct.】
7、单选题：
The area under a standard normal curve between z=0 and z=-1.75 is:
选项：
A: .0401.
B: .9599.
C: .4599.
D: 1.4599.
答案: 【 .4599.】
8、单选题：
The area under a standard normal curve for z values less than 1.75 is:
选项：
A: .0401.
B: .9599.
C: .4599
D: 1.4599.
答案: 【 .9599.】
9、单选题：
In the standard normal distribution, what is the probability of finding a z value between z=-1.25 and z=-1.00?
选项：
A: 0.3944
B: 0.3413
C: 0.7357
D: 0.0531
答案: 【 0.0531】
10、单选题：
In the standard normal distribution, what is the z-statistic for the 80th percentile?
选项：
A: 0.8400
B: 0.2881
C: 0.2000
D: 0.8000
答案: 【 0.8400】
慕课 第三章 Chapter 3 Describing Data Numerical Measures
第三单元测验
1、单选题：
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、单选题：
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、单选题：
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、单选题：
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、单选题：
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、单选题：
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、单选题：
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、单选题：
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、单选题：
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、单选题：
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.】