2020 数理统计学(云南大学)1455052453 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:2020-03-09到2020-07-13
本篇答案更新状态:已完结

第一章 简介及数据收集 第一章测验题

1、 问题:The process of using sample statistics to draw conclusions about true population parameters is called
选项：
A:statistical inference.
B:the scientific method.
C:sampling.
D:descriptive statistics.
答案: 【statistical inference.】

2、 问题:Those methods involving the collection, presentation, and characterization of a set of data in order to properly describe the various features of that set of data are called
选项：
A:statistical inference.
B:the scientific method.
C:sampling.
D:descriptive statistics.
答案: 【descriptive statistics.】

3、 问题:The collection and summarization of the socioeconomic and physical characteristics of the employees of a particular firm is an example of
选项：
A:inferential statistics.
B:descriptive statistics.
C:a parameter.
D:a statistic.
答案: 【descriptive statistics.】

4、 问题:The estimation of the population average family expenditure on food based on the sample average expenditure of 1,000 families is an example of
选项：
A:inferential statistics.
B:descriptive statistics.
C:a parameter.
D:a statistic.
答案: 【inferential statistics.】

5、 问题:The universe or “totality of items or things” under consideration is called
选项：
A:a sample.
B:a population.
C:a parameter.
D:a statistic.
答案: 【a population.】

6、 问题:The portion of the universe that has been selected for analysis is called
选项：
A:a sample.
B:a frame.
C:a parameter.
D:a statistic.
答案: 【a sample.】

7、 问题:A summary measure that is computed to describe a characteristic from only a sample of the population is called
选项：
A:a parameter.
B:a census.
C:a statistic.
D:the scientific method.
答案: 【a statistic.】

8、 问题:A summary measure that is computed to describe a characteristic of an entire population is called
选项：
A:a parameter.
B:a census.
C:a statistic.
D:the scientific method.
答案: 【a parameter.】

9、 问题:Which of the following is most likely a population as opposed to a sample?
选项：
A:respondents to a newspaper survey.
B:the first 5 students completing an assignment.
C:every third person to arrive at the bank.
D:registered voters in a county.
答案: 【registered voters in a county.】

第二章 用图表展示数据 第二章测验题

1、 问题:An insurance company evaluates many numerical variables about a person before deciding on an appropriate rate for automobile insurance. A representative from a local insurance agency selected a random sample of insured drivers and recorded, X, the number of claims each made in the last 3 years, with the following results. f is the corresponding frequency.X 1 2 3 4 5 f 14 18 12 5 1How many total claims are represented in the sample?
选项：
A:15
B:50
C:111
D:250
答案: 【111】

2、 问题:An insurance company evaluates many numerical variables about a person before deciding on an appropriate rate for automobile insurance. A representative from a local insurance agency selected a random sample of insured drivers and recorded, X, the number of claims each made in the last 3 years, with the following results. f is the corresponding frequency.X 1 2 3 4 5 f 14 18 12 5 1How many drivers are represented in the sample?
选项：
A:5
B:15
C:18
D:50
答案: 【50】

3、 问题:A type of vertical bar chart in which the categories are plotted in the descending rank order of the magnitude of their frequencies is called a
选项：
A:contingency table.
B:Pareto diagram.
C:dot plot.
D:pie chart.
答案: 【Pareto diagram.】

4、 问题:The width of each bar in a histogram corresponds to the
选项：
A:differences between the bounaries of the class.
B:number of observations in each class.
C:midpont of each class.
D:percentage of observations in each class.
答案: 【differences between the bounaries of the class.】

5、 问题:When polygons or histograms are constructed, which axis must show the true zero or “origin”?
选项：
A:The horizontal axis.
B:The vertical axis.
C:Both the horizontal axis and vertical axis.
D:Neither the horizontal nor the vertical axis.
答案: 【The vertical axis.】

6、 问题:A professor of economics at a small Texas university wanted to determine what year in school students were taking his tough economics course. Shown below is a pie chart of the results. What percentage of the class took the course prior to reaching their senior year?
选项：
A:14%
B:44%
C:54%
D:86%
答案: 【86%】

7、 问题:When constructing charts, the following is plotted at the class midpoints:
选项：
A:frequency histograms.
B:percentage polygons.
C:cumulative relative frequency ogives.
D:All of the above.
答案: 【percentage polygons.】

8、 问题:A survey was conducted to determine how people rated the quality of programming available on television. Respondents were asked to rate the overall quality from 0 (no quality at all) to 100 (extremely good quality). The stem-and-leaf display of the data is shown below.Stem Leaves3 2 4 4 0 3 4 7 8 9 9 95 0 1 1 2 3 4 56 1 2 5 6 67 0 189 2What percentage of the respondents rated overall television quality with a rating of 50 or below?
选项：
A:11
B:40
C:44
D:56
答案: 【44】

9、 问题:The following are the durations in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier.Time (in minutes) Relative Frequency0 but less than 5 0.37 5 but less than 10 0.22 10 but less than 15 0.15 15 but less than 20 0.10 20 but less than 25 0.07 25 but less than 30 0.07 30 or more 0.02 If 1,000 calls were randomly sampled, how many calls laasted under 10 minutes?
选项：
A:220
B:370
C:410
D:590
答案: 【590】

10、 问题:A sample of 200 students at a Big-Ten university was taken after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they did well or poorly on the midterm. The following table contains the results. Did Well in Midterm Did Poorly in MidtermStudying for Exam 80 20Went bar hopping 30 70 If the sample is a good representation of the population, we can expect percent of the students in the population to spend the weekend studying and do poorly on the midterm.
选项：
A:10
B:20
C:45
D:50
答案: 【10】

第三章 用数值度量描述数据 第三章测验题

1、 问题:Which ofthe following statistics is not a measure of central tendency?
选项：
A:Arithmetic mean.
B:Median.
C:Mode.
D:Q3.
答案: 【Q3.】

2、 问题:Which of the arithmetic mean, median, mode, and geometric mean are resistant measures of central tendency?
选项：
A:The arithmetric mean and median only.
B:The median and mode only.
C:The mode and geometric mean only.
D:The arithmetic mean and mode only.
答案: 【The median and mode only.】

3、 问题:In a right-skewed distribution
选项：
A:the median equals the arithmetic mean.
B:the median is less than the arithmetic mean.
C:the median is larger than the arithmetic mean.
D:none of the above.
答案: 【the median is less than the arithmetic mean.】

4、 问题:In a perfectly symmetrical bell-shaped “normal” distribution
选项：