MOOC statistics(浙江财经大学)1463188164 最新慕课完整章节测试答案
Chapter 1 Introduction to statistics
文章目录
- Chapter 1 Introduction to statistics
- Chapter 10 Time Series Analysis and Forecasting
- Chapter 2 Descriptive Statistics：Summarizing data using tabular and graphical techniques
- Chapter 3 Descriptive Statistics：Summarizing data using numerical techniques
- Chapter 4 Probability and Distributions
- Chapter 5 Survey Sampling
- Chapter 6 Hypothesis Testing
- Chapter 7 Analysis of Variance
- Chapter 8 Correlation and Regression
- Chapter 9 Multiple Regression
quizzes1
1、单选题：
In a questionnaire, respondents are asked to mark their gender as male or female. Gender is an example of the（ ）
选项：
A: A.ordinal scale
B: B.nominal scale
C: C.ratio scale
D: D.interval scale
答案: 【 B.nominal scale】
2、单选题：
The nominal scale of measurement has the properties of the（ ）.
选项：
A: A.ordinal scale
B: B.only interval scale
C: C.ratio scale
D: D.None of these alternatives is correct.
答案: 【 D.None of these alternatives is correct.】
3、单选题：
The scale of measurement that is used to rank order the observation for a variable is called the（ ）.
选项：
A: A.ratio scale
B: B.ordinal scale
C: C.nominal scale
D: D.interval scale
答案: 【 B.ordinal scale】
4、单选题：
The ratio scale of measurement has the properties of（ ）.
选项：
A: A.only the ordinal scale
B: B.only the nominal scale
C: C.the rank scale
D: D.the interval scale
答案: 【 D.the interval scale】
5、单选题：
The interval scale of measurement has the properties of the（ ）.
选项：
A: A.ratio and nominal scales
B: B.ratio and ordinal scales
C: C.ratio scale
D: D.None of these alternatives is correct.
答案: 【 D.None of these alternatives is correct.】
6、单选题：
Data obtained from a nominal scale（ ）.
选项：
A: A.must be alphabetic
B: B.can be either numeric or nonnumeric
C: C.must be numeric
D: D.must rank order the data
答案: 【 B.can be either numeric or nonnumeric】
7、单选题：
The scale of measurement that has an inherent zero value defined is the（ ）.
选项：
A: A.ratio scale
B: B.nominal scale
C: C.ordinal scale
D: D.interval scale
答案: 【 A.ratio scale】
8、单选题：
Quantitative data refers to data obtained with a(n)（ ）.
选项：
A: A.ordinal scale
B: B.nominal scale
C: C.either interval or ratio scale
D: D.only interval scale
答案: 【 C.either interval or ratio scale】
9、单选题：
The entities on which data are collected are（ ）.
选项：
A: A.elements
B: B.populations
C: C.samples
D: D.None of these alternatives is correct.
答案: 【 A.elements】
10、单选题：
The set of measurements collected for a particular element is (are) called（ ）.
选项：
A: A.variables
B: B.observations
C: C.samples
D: D.None of these alternatives is correct.
答案: 【 B.observations】
11、单选题：
The weight of a candy bar in ounces is an example of（ ）.
选项：
A: A.categorical data
B: B.either categorical or quantitative data
C: C.weight data
D: D.quantitative data
答案: 【 D.quantitative data】
12、单选题：
The height of a building, measured in feet, is an example of（ ）.
选项：
A: A.categorical data
B: B.either categorical or quantitative data
C: C.feet data
D: D.quantitative data
答案: 【 D.quantitative data】
13、单选题：
Income is an example of（ ）
选项：
A: A.a variable that uses the ratio scale
B: B.a variable that uses interval scale
C: C.categorical data
D: D.quantitative data
E: E.None of these alternatives is correct.
答案: 【 A.a variable that uses the ratio scale;
D.quantitative data】
14、单选题：
Since a sample is a subset of the population, the sample mean（ ）.
选项：
A: A.is always smaller than the mean of the population
B: B.is always larger than the mean of the population
C: C.must be equal to the mean of the population
D: D.can be larger, smaller, or equal to the mean of the population
答案: 【 D.can be larger, smaller, or equal to the mean of the population】
15、单选题：
In experimental studies, the variable of interest（ ）.
选项：
A: A.is not controlled
B: B.is controlled
C: C.must be numerical
D: D.cannot be numerical
答案: 【 B.is controlled】
16、单选题：
On a street, the houses are numbered from 300 to 450. The house numbers are examples of（ ）.
选项：
A: A.categorical data
B: B.quantitative data
C: C.both quantitative and categorical data
D: D.neither quantatative nor categorical data
答案: 【 A.categorical data】
17、多选题：
Which of the following can be classified as quantitative data?
选项：
A: A.The height of a building, measured in feet.
B: B.The weight of a candy bar in ounces.
C: C.Income in dollars.
D: D.Social security numbers.
E: E.None of these alternatives is correct.
答案: 【 A.The height of a building, measured in feet.;
B.The weight of a candy bar in ounces.;
C.Income in dollars.】
18、多选题：
Which of the following variables use the interval scale of measurement?
选项：
A: A.social security number
B: B.temperature
C: C.height
D: D.income
E: E.latitude
答案: 【 B.temperature;
E.latitude】
19、多选题：
Which scale of measurement can be either numeric or nonnumeric?
选项：
A: A.nominal
B: B.ratio
C: C.interval
D: D.ordinal
E: E.None of these alternatives is correct
答案: 【 A.nominal;
D.ordinal】
20、多选题：
In a questionnaire, respondents are asked to mark their gender as male or female. Gender is an （ ）.
选项：
A: A.ordinal scale
B: B.nominal scale
C: C.categorical variable
D: D.quantitative variable
E: E.None of these alternatives is correct.
答案: 【 B.nominal scale;
C.categorical variable】
21、多选题：
Arithmetic operations are appropriate for（ ）
选项：
A: A.the ratio scale
B: B.the interval scale
C: C.categorical data
D: D.quantitative data
E: E.None of these alternatives is correct.
答案: 【 A.the ratio scale;
B.the interval scale;
D.quantitative data】
22、判断题：
Quantitative data may be either numeric or nonnumeric.
选项：
A: 正确
B: 错误
答案: 【 错误】
23、判断题：
In experimental studies, the variable of interest is controlled.
选项：
A: 正确
B: 错误
答案: 【 正确】
24、判断题：
A portion of the population selected to represent the population is called a census.
选项：
A: 正确
B: 错误
答案: 【 错误】
25、判断题：
Arithmetic operations are inappropriate for either categorical or quantitative data.
选项：
A: 正确
B: 错误
答案: 【 错误】
26、判断题：
Ordinary arithmetic operations are meaningful either with quantitative or categorical data.
选项：
A: 正确
B: 错误
答案: 【 错误】
27、判断题：
Another name for "observations" is cases.
选项：
A: 正确
B: 错误
答案: 【 正确】
Chapter 10 Time Series Analysis and Forecasting
quizzes10
1、单选题：
Which of the following is not present in a time series?
选项：
A: seasonality
B: operational variations
C: trend
D: cycles
答案: 【 operational variations】
2、单选题：
Which of the following smoothing constants would make an exponential smoothing forecast equivalent to a naive forecast?
选项：
A: 0
B: 1 divided by the number of periods
C: 0.5
D: 1.0
答案: 【 1.0】
3、单选题：
The time series component which reflects a regular, multi-year pattern of being above and below the trend line is
选项：
A: a trend
B: seasonal
C: cyclical
D: irregular
答案: 【 cyclical】
4、单选题：
The time series component that reflects variability during a single year is called
选项：
A: a trend
B: seasonal
C: cyclical
D: irregular
答案: 【 seasonal】
5、单选题：
The time series component that reflects variability due to natural disasters is called
选项：
A: a trend
B: seasonal
C: cyclical
D: irregular
答案: 【 irregular】
6、单选题：
The time series component that reflects gradual variability over a long time period is called
选项：
A: a trend
B: seasonal
C: cyclical
D: irregular
答案: 【 a trend】
7、单选题：
The trend component is easy to identify by using
选项：
A: moving averages
B: exponential smoothing
C: regression analysis
D: the Delphi approach
答案: 【 regression analysis】
8、单选题：
If data for a time series analysis is collected on an annual basis only, which component may be ignored?
选项：
A: trend
B: seasonal
C: cyclical
D: irregular
答案: 【 seasonal】
9、单选题：
For the following time series, you are given the moving average forecast. Time PeriodTime Series ValueMoving Average Forecast123 217 317 42619511206231871720 The mean squared error equals
选项：
A: 0
B: 6
C: 41
D: 164
答案: 【 41】
10、单选题：
If the estimate of the trend component is 158.2, the estimate of the seasonal component is 94%, the estimate of the cyclical component is 105%, and the estimate of the irregular component is 98%, then the multiplicative model will produce a forecast of
选项：
A: 1.53
B: 1.53%
C: 153.02
D: 153,020,532
答案: 【 153.02】
11、单选题：
Below you are given the first four values of a time series. Time PeriodTime Series Value118220325417 Using a 4-period moving average, the forecasted value for period 5 is
选项：
A: 2.5
B: 17
C: 20
D: 10
答案: 【 20】
12、单选题：
Below you are given the first two values of a time series. You are also given the first two values of the exponential smoothing forecast. Time Period (t)Time Series Value (Y t)Exponential SmoothingForecast (F t)1181822218 If the smoothing constant equals .3, then the exponential smoothing forecast for time period three is
选项：
A: 18
B: 19.2
C: 20
D: 40
答案: 【 19.2】
13、单选题：
Consider the following time series. t1234 Yi479 10 Refer to Exhibit 18-2. The slope of linear trend equation, b1, is
选项：
A: 2.5
B: 2.0
C: 1.0
D: 1.25
答案: 【 2.0】
14、单选题：
Refer to Exhibit 18-2. The intercept, b0, is
选项：
A: 2.5
B: 2.0
C: 1.0
D: 1.25
答案: 【 2.5】
15、单选题：
Refer to Exhibit 18-2. The forecast for period 5 is
选项：
A: 10.0
B: 2.5
C: 12.5
D: 4.5
答案: 【 12.5】
16、多选题：
In the time series formed by the time indicator
选项：
A: The values of the indicators can be added.
B: The values of the indicators cannot be added.
C: The sum of the values in the series is meaningless.
D: The data in the series is obtained through continuous registration. Interval is directly related
答案: 【 The values of the indicators cannot be added. ;
The sum of the values in the series is meaningless. 】
17、多选题：
The following are period series
选项：
A: Population at the end of each year
B: Number of babies born in each year
C: Monthly merchandise inventory
D: Monthly merchandise sales
答案: 【 Number of babies born in each year ;
Monthly merchandise sales】
18、多选题：
The main speed indicators of the time series are
选项：
A: Fixed-base development speed and month-on-month growth rate
B: Fixed-base growth rate and month-on-month growth rate
C: Sequential average of the development speed of each chain
D: Sequential average of the growth rate of each ring
E: Average growth rate
答案: 【 Fixed-base development speed and month-on-month growth rate ;
Fixed-base growth rate and month-on-month growth rate;
Average growth rate】
19、多选题：
The development level in the time series includes
选项：
A: Reporting period level and base period level
B: intermediate level
C: initial level
D: final level
E: average level
答案: 【 intermediate level ;
initial level ;
final level 】
20、多选题：
The quantitative relationship between the fixed-base development speed and the chain development speed is
选项：
A: The basic period of comparison is different.
B: The economic content reflected is different.
C: Both are speed indicators.
D: The fixed-base development speed is equal to the product of the chain development speeds
E: The ratio of the development speed of two adjacent fixed bases is equal to the corresponding chain development speed
答案: 【 The fixed-base development speed is equal to the product of the chain development speeds;
The ratio of the development speed of two adjacent fixed bases is equal to the corresponding chain development speed】
Chapter 2 Descriptive Statistics：Summarizing data using tabular and graphical techniques
quizzes2
1、单选题：
A frequency distribution is a tabular summary of data showing the
选项：
A: fraction of items in several classes
B: percentage of items in several classes
C: relative percentage of items in several classes
D: number of items in several classes
答案: 【 number of items in several classes】
2、单选题：
A frequency distribution is
选项：
A: a tabular summary of a set of data showing the relative frequency
B: a graphical form of representing data
C: a tabular summary of a set of data showing the frequency of items in each of several nonoverlapping classes
D: a graphical device for presenting categorical data
答案: 【 a tabular summary of a set of data showing the frequency of items in each of several nonoverlapping classes】
3、单选题：
A tabular summary of a set of data showing the fraction of the total number of items in several classes is a
选项：
A: frequency distribution
B: relative frequency distribution
C: frequency
D: cumulative frequency distribution
答案: 【 relative frequency distribution】
4、单选题：
The relative frequency of a class is computed by
选项：
A: dividing the midpoint of the class by the sample size
B: dividing the frequency of the class by the midpoint
C: dividing the sample size by the frequency of the class
D: dividing the frequency of the class by the sample size
答案: 【 dividing the frequency of the class by the sample size】
5、单选题：
The percent frequency of a class is computed by
选项：
A: multiplying the relative frequency by 10
B: dividing the relative frequency by 100
C: multiplying the relative frequency by 100
D: adding 100 to the relative frequency
答案: 【 multiplying the relative frequency by 100】
6、单选题：
The sum of frequencies for all classes will always equal
选项：
A: 1
B: the number of elements in a data set
C: the number of classes
D: a value between 0 and 1
答案: 【 the number of elements in a data set】
7、单选题：
Fifteen percent of the students in a school of Business Administration are majoring in Economics, 20% in Finance, 35% in Management, and 30% in Accounting. The graphical device(s) which can be used to present these data is (are)
选项：
A: a line chart
B: only a bar chart
C: only a pie chart
D: both a bar chart and a pie chart
答案: 【 both a bar chart and a pie chart】
8、单选题：
A cumulative relative frequency distribution shows
选项：
A: the proportion of data items with values less than or equal to the upper limit of each class
B: the proportion of data items with values less than or equal to the lower limit of each class
C: the percentage of data items with values less than or equal to the upper limit of each class
D: the percentage of data items with values less than or equal to the lower limit of each class
答案: 【 the proportion of data items with values less than or equal to the upper limit of each class】
9、单选题：
The sum of the relative frequencies for all classes will always equal
选项：
A: the sample size
B: the number of classes
C: one
D: any value larger than one
答案: 【 one】
10、单选题：
The most common graphical presentation of quantitative data is a
选项：
A: histogram
B: bar chart
C: relative frequency
D: pie