大学MOOC Basic Econometrics(Dongbei University of Finance & Economics)1458868161 最新慕课完整章节测试答案
Part 1 Basic Statistics Chapter 1 Estimation Confidence intervals
文章目录
- Part 1 Basic Statistics Chapter 1 Estimation Confidence intervals
- Part 1 Basic Statistics Chapter 3 Two-sample Tests of Hypothesis
- Part 1 Basic Statistics Chapter 4 Analysis of Variance
- Part 1 Basic StatisticsChapter 2 Hypothesis Testiing
- Part 2 Basic Econometrics Chapter 1 What is Econometrics
- Part 2 Basic Econometrics Chapter 2 Monte Carlo Simulations
- Part 2 Basic Econometrics Chapter 3 Mathematical Tools for Econometrics
- Part 2 Basic Econometrics Chapter 4 Regression with One Explanator
- Part 2 Basic Econometrics Chapter 5 Interpreting Regression Results Logarithms
- Part 2 Basic Econometrics Chapter 6 Multiple Regression
Test 1
1、单选题：
When estimating population parameters, a point estimate is:
选项：
A: A range of possible values for a population parameter.
B: Always equal to a population value.
C: A statistic that estimates a population parameter.
D: The population mean.
答案: 【 A statistic that estimates a population parameter.】
2、单选题：
A characteristic of all confidence intervals is that:
选项：
A: a confidence interval always includes the population parameter.
B: a confidence interval always increases in width as the sample size is increased.
C: a confidence interval cannot include a value of 0.
D: a confidence interval always increases in width as the level of confidence increases.
答案: 【 a confidence interval always increases in width as the level of confidence increases.】
3、单选题：
If we wish to decrease the width (increase the precision) of a confidence interval, we would:
选项：
A: increase the size of the sample.
B: reduce the size of the population.
C: raise the level of confidence.
D: compute the mean.
答案: 【 increase the size of the sample.】
4、单选题：
We wish to develop a confidence interval for the population mean. The population standard deviation is known. We have a sample of 40 observations. We decide to use the 92 percent level of confidence. The appropriate value of z is:
选项：
A: 1.75.
B: 1.96.
C: 1.65.
D: 2.58.
答案: 【 1.75.】
5、单选题：
We wish to develop a confidence interval for the population mean. The population follows the normal distribution, the standard deviation of the population is 3, and we have a sample of 10 observations. We decide to use the 90 percent level of confidence. The appropriate statistic for the level of confidence is:
选项：
A: z = 1.645.
B: z = 1.960.
C: t = 1.833.
D: t = 2.262.
答案: 【 z = 1.645.】
6、单选题：
The fraction of a sample possessing a certain trait is called a:
选项：
A: proportion.
B: population.
C: mean.
D: confidence interval.
答案: 【 proportion.】
7、单选题：
To develop a confidence interval for a proportion:
选项：
A: we approximate the binomial distribution with a normal distribution.
B: the sample size should be at least 100.
C: p should be less than .05.
D: we use the t statistic.
答案: 【 we approximate the binomial distribution with a normal distribution.】
8、单选题：
We wish to develop a confidence interval for the population mean. The population follows the normal distribution and the population standard deviation is 3. We collect a random sample of 10 observations. We decide to use the 90 percent level of confidence. The margin of error for the confidence interval is:
选项：
A: ± 1.565.
B: ± 1.645.
C: ± 2.262.
D: ± 2.146.
答案: 【 ± 1.565.】
9、单选题：
We wish to develop a confidence interval for the population mean. The population follows the normal distribution. We collect a random sample of 10 observations and the sample standard deviation is 3. We decide to use the 95 percent level of confidence. The margin of error for the confidence interval is:
选项：
A: ± 2.146.
B: ± 1.859.
C: ± 1.960.
D: ± 2.262.
答案: 【 ± 2.146.】
10、多选题：
Which of the following statements is a characteristic of the t distribution?
选项：
A: It is a continuous distribution.
B: It is a discrete distribution.
C: It has a mean of 0.
D: It is symmetrical.
答案: 【 It is a continuous distribution.;
It has a mean of 0.;
It is symmetrical.】
Tests of this class
1、单选题：
What is point estimation?
选项：
A: Point estimation is only one observation.
B: point estimation is one value of the sample statistics to estimate the population parameter.
C: point estimation a range to estimate the population parameters.
D: none of the abave is correct.
答案: 【 point estimation is one value of the sample statistics to estimate the population parameter. 】
Part 1 Basic Statistics Chapter 3 Two-sample Tests of Hypothesis
Test 3
1、单选题：
In a hypothesis test comparing two population means, the "=" sign always appears in the:
选项：
A: null hypothesis.
B: alternate hypothesis.
C: upper tail of the test statistic.
D: lower tail of the test statistic.
答案: 【 null hypothesis.】
2、单选题：
In a hypothesis test comparing two population means, we use the z distribution when:
选项：
A: both population standard deviations are known.
B: the two population standard deviations are equal.
C: both populations have at least 4000 observations.
D: nπ and n(1-π) are both greater than 5.
答案: 【 both population standard deviations are known.】
3、单选题：
For the hypothesis, H0: µ1 ≤ µ2, a random sample of 10 observations is selected from the first normal population and 8 from the second normal population. What is the number of degrees of freedom?
选项：
A: 16
B: 18
C: 17
D: 9
答案: 【 16】
4、单选题：
For the hypothesis, H0: µ1 ≤ µ2, (.01 significance level), a random sample of 10 observations is selected from the first normal population and 8 from the second normal population. Population standard deviations are unknown. What is (are) the critical value(s)?
选项：
A: 2.583
B: -2.921, 2.921
C: -2.583, 2.583
D: -2.583
答案: 【 2.583】
5、单选题：
When testing a hypothesis about the means for two independent populations (population standard deviations unknown), what should be true?
选项：
A: Both populations are normally distributed.
B: nπ and n(1-π) are both greater than